feat(memory): système de mémoire projet model-agnostic (L14, LOT A+B+C)

Base de connaissance persistante par projet, indépendante de tout modèle/CLU
et de git. Cadrage archi en §14.5 (ARCHITECTURE.md), cycle Archi→Dev→Test.

LOT A — étage 1 (.md, source de vérité)
  - domaine: entité Memory (+ MemorySlug, MemoryType, MemoryFrontmatter,
    MemoryLink, MemoryIndexEntry), liens [[slug]], index MEMORY.md dérivé
  - port MemoryStore + MemoryError, adapter FsMemoryStore (.ideai/memory/)
  - application: 7 use cases (Create/Update/List/Get/Delete/ReadIndex/
    ResolveLinks), From<MemoryError> for AppError
  - app-tauri: commandes + DTO, events MemorySaved/MemoryDeleted
  - suppression de la variante morte DomainError::MalformedFrontmatter

LOT B — rappel adaptatif (étage 1)
  - port MemoryRecall + MemoryQuery, adapter NaiveMemoryRecall (troncature
    au budget de tokens, court-circuit budget-0), use case RecallMemory

LOT C — étage 2 vectoriel (structure complète, zéro dépendance lourde)
  - port Embedder + EmbedderError, profils déclaratifs EmbedderProfile/
    EmbedderStrategy (embedder.json)
  - VectorMemoryRecall (cosinus, cache .ideai/memory/.index/ gitignoré)
  - AdaptiveMemoryRecall (bascule pure should_use_vector), défaut none
  - HashEmbedder (déterministe, tests), StubEmbedder (onnx/server/api)

Tests: 57 binaires verts, build + clippy --workspace sans warning.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/domain/src/error.rs

@@ -65,6 +65,13 @@ pub enum DomainError {
         reason: String,
     },
 
+    /// A memory slug was not valid kebab-case (`[a-z0-9-]`, non-empty).
+    #[error("`{value}` is not a valid kebab-case slug")]
+    InvalidSlug {
+        /// The offending value.
+        value: String,
+    },
+
     /// A generic invariant violation with an explanatory message.
     #[error("invariant violated: {0}")]
     Invariant(String),

crates/domain/src/events.rs

@@ -2,6 +2,7 @@
 //! presentation layer (ARCHITECTURE §3.2).
 
 use crate::ids::{AgentId, ProjectId, SessionId, SkillId, TemplateId};
+use crate::memory::MemorySlug;
 use crate::template::TemplateVersion;
 
 /// Events emitted by the domain/application as state changes occur.
@@ -90,6 +91,21 @@ pub enum DomainEvent {
         /// Whether IdeA handled it successfully.
         ok: bool,
     },
+    /// A memory note was created or updated (`.md` written, index upserted).
+    MemorySaved {
+        /// The saved note's slug.
+        slug: MemorySlug,
+    },
+    /// A memory note was deleted.
+    MemoryDeleted {
+        /// The deleted note's slug.
+        slug: MemorySlug,
+    },
+    /// The aggregated `MEMORY.md` index was rebuilt for a project.
+    MemoryIndexRebuilt {
+        /// The project whose index was rebuilt.
+        project_id: ProjectId,
+    },
     /// Raw PTY output (usually routed to a dedicated channel, not this bus).
     PtyOutput {
         /// The session.

crates/domain/src/lib.rs

@@ -37,6 +37,7 @@ pub mod git;
 pub mod ids;
 pub mod layout;
 pub mod markdown;
+pub mod memory;
 pub mod orchestrator;
 pub mod ports;
 pub mod profile;
@@ -67,10 +68,16 @@ pub use skill::{Skill, SkillRef, SkillScope};
 
 pub use template::{AgentTemplate, TemplateVersion};
 
-pub use profile::{AgentProfile, ContextInjection, SessionStrategy};
+pub use profile::{
+    AgentProfile, ContextInjection, EmbedderProfile, EmbedderStrategy, SessionStrategy,
+};
 
 pub use markdown::MarkdownDoc;
 
+pub use memory::{
+    Memory, MemoryFrontmatter, MemoryIndexEntry, MemoryLink, MemorySlug, MemoryType,
+};
+
 pub use remote::{RemoteKind, RemoteRef, SshAuth};
 
 pub use terminal::{PtySize, SessionKind, SessionStatus, TerminalSession};
@@ -87,9 +94,11 @@ pub use events::DomainEvent;
 pub use orchestrator::{OrchestratorCommand, OrchestratorError, OrchestratorRequest};
 
 pub use ports::{
-    AgentContextStore, AgentRuntime, Clock, ContextInjectionPlan, DirEntry, EventBus, EventStream,
+    AgentContextStore, AgentRuntime, Clock, ContextInjectionPlan, DirEntry, Embedder,
+    EmbedderError, EventBus, EventStream,
     ExitStatus, FileSystem, FsError, GitCommitInfo, GitError, GitFileStatus, GitPort, GraphCommit,
-    IdGenerator, Output, OutputStream, PreparedContext, ProcessError, ProcessSpawner, ProfileStore,
-    ProjectStore, PtyError, PtyHandle, PtyPort, RemoteError, RemoteHost, RemotePath, RuntimeError,
-    SpawnSpec, StoreError, TemplateStore,
+    IdGenerator, MemoryError, MemoryQuery, MemoryRecall, MemoryStore, Output, OutputStream,
+    PreparedContext, ProcessError,
+    ProcessSpawner, ProfileStore, ProjectStore, PtyError, PtyHandle, PtyPort, RemoteError,
+    RemoteHost, RemotePath, RuntimeError, SpawnSpec, StoreError, TemplateStore,
 };

crates/domain/src/memory.rs

@@ -0,0 +1,194 @@
+//! Memory entity — the persistent, model-agnostic knowledge base of a project
+//! (LOT A, étage 1: `.md` files as the single source of truth).
+//!
+//! A [`Memory`] is one Markdown note stored under `.ideai/memory/<slug>.md`. Its
+//! frontmatter carries the structured metadata (a kebab-case [`MemorySlug`], a
+//! human-readable description, and a [`MemoryType`]); its body is opaque
+//! [`MarkdownDoc`] text. Notes cross-reference one another via `[[slug]]` wiki
+//! links, scanned by [`Memory::outgoing_links`].
+//!
+//! The aggregated `.ideai/memory/MEMORY.md` index (one [`MemoryIndexEntry`] line
+//! per note) is derived data: [`Memory::index_entry`] produces a note's row. The
+//! adapter (`FsMemoryStore`) owns the on-disk YAML frontmatter and index file
+//! formats; the domain stays I/O-free and format-neutral.
+
+use serde::{Deserialize, Serialize};
+
+use crate::error::DomainError;
+use crate::markdown::MarkdownDoc;
+
+/// A kebab-case identifier for a memory note (`[a-z0-9]` plus `-`), used both as
+/// the on-disk file stem (`<slug>.md`) and as the `[[slug]]` link target.
+///
+/// Invariants enforced by [`MemorySlug::new`]:
+/// - non-empty,
+/// - only lowercase ASCII letters, ASCII digits, and `-`,
+/// - therefore no uppercase, no whitespace, and no `.` (so no `..` traversal).
+#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord, Serialize, Deserialize)]
+#[serde(transparent)]
+pub struct MemorySlug(String);
+
+impl MemorySlug {
+    /// Builds a validated kebab-case slug.
+    ///
+    /// # Errors
+    /// [`DomainError::InvalidSlug`] if `raw` is empty or contains any character
+    /// outside `[a-z0-9-]`.
+    pub fn new(raw: impl Into<String>) -> Result<Self, DomainError> {
+        let raw = raw.into();
+        let invalid = || DomainError::InvalidSlug {
+            value: raw.clone(),
+        };
+        if raw.is_empty() {
+            return Err(invalid());
+        }
+        if raw
+            .chars()
+            .all(|c| c.is_ascii_lowercase() || c.is_ascii_digit() || c == '-')
+        {
+            Ok(Self(raw))
+        } else {
+            Err(invalid())
+        }
+    }
+
+    /// Returns the slug as a string slice.
+    #[must_use]
+    pub fn as_str(&self) -> &str {
+        &self.0
+    }
+}
+
+impl std::fmt::Display for MemorySlug {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(&self.0)
+    }
+}
+
+/// The kind of a memory note, driving how it is surfaced and prioritised.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum MemoryType {
+    /// A user-authored preference or instruction.
+    User,
+    /// Feedback captured from a prior interaction.
+    Feedback,
+    /// A project-level fact or decision.
+    Project,
+    /// A reference / external knowledge note.
+    Reference,
+}
+
+/// The structured frontmatter of a memory note.
+///
+/// Serialised with `type` (not `kind`) as the discriminator field name, matching
+/// the on-disk YAML `metadata.type` (the adapter maps the nesting). Invariant:
+/// `description` is non-empty (enforced at [`Memory::new`]).
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct MemoryFrontmatter {
+    /// Stable kebab-case identifier (also the file stem).
+    pub name: MemorySlug,
+    /// Human-readable one-line description (the index hook). Non-empty.
+    pub description: String,
+    /// The note's kind.
+    #[serde(rename = "type")]
+    pub r#type: MemoryType,
+}
+
+/// A `[[slug]]` wiki link found in a note's body, pointing at another note.
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct MemoryLink {
+    /// The linked note's slug.
+    pub target: MemorySlug,
+}
+
+/// One row of the aggregated `MEMORY.md` index: the `- [Title](slug.md) — hook`
+/// line, decomposed into its parts.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct MemoryIndexEntry {
+    /// The note's slug.
+    pub slug: MemorySlug,
+    /// The note's display title (currently the slug; titles are derived later).
+    pub title: String,
+    /// The one-line hook (the frontmatter description).
+    pub hook: String,
+    /// The note's kind.
+    pub r#type: MemoryType,
+}
+
+/// A memory note: validated frontmatter plus an opaque Markdown body.
+///
+/// Invariants enforced by [`Memory::new`]:
+/// - `frontmatter.description` non-empty,
+/// - `body` non-empty (an empty note carries no knowledge).
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Memory {
+    /// Structured metadata.
+    pub frontmatter: MemoryFrontmatter,
+    /// Markdown body of the note.
+    pub body: MarkdownDoc,
+}
+
+impl Memory {
+    /// Builds a validated memory note.
+    ///
+    /// # Errors
+    /// - [`DomainError::EmptyField`] if `frontmatter.description` is empty,
+    /// - [`DomainError::EmptyField`] if `body` is empty.
+    pub fn new(frontmatter: MemoryFrontmatter, body: MarkdownDoc) -> Result<Self, DomainError> {
+        crate::validation::non_empty(&frontmatter.description, "memory.description")?;
+        if body.is_empty() {
+            return Err(DomainError::EmptyField {
+                field: "memory.body",
+            });
+        }
+        Ok(Self { frontmatter, body })
+    }
+
+    /// Returns the note's slug (its identity).
+    #[must_use]
+    pub fn slug(&self) -> &MemorySlug {
+        &self.frontmatter.name
+    }
+
+    /// Scans the body for `[[slug]]` wiki links, in order of appearance.
+    ///
+    /// Tokens whose inner text is not a valid [`MemorySlug`] are skipped (a
+    /// malformed link is not a hard error here). Duplicates are preserved — the
+    /// caller dedups if it wants a unique link set. No regex: a small linear scan.
+    #[must_use]
+    pub fn outgoing_links(&self) -> Vec<MemoryLink> {
+        let text = self.body.as_str();
+        let bytes = text.as_bytes();
+        let mut links = Vec::new();
+        let mut i = 0;
+        while i + 1 < bytes.len() {
+            if bytes[i] == b'[' && bytes[i + 1] == b'[' {
+                // Find the closing `]]`.
+                if let Some(close) = text[i + 2..].find("]]") {
+                    let inner = &text[i + 2..i + 2 + close];
+                    if let Ok(target) = MemorySlug::new(inner) {
+                        links.push(MemoryLink { target });
+                    }
+                    i = i + 2 + close + 2;
+                    continue;
+                }
+                // No closing token: stop scanning further `[[`.
+                break;
+            }
+            i += 1;
+        }
+        links
+    }
+
+    /// Produces this note's row in the aggregated `MEMORY.md` index.
+    #[must_use]
+    pub fn index_entry(&self) -> MemoryIndexEntry {
+        MemoryIndexEntry {
+            slug: self.frontmatter.name.clone(),
+            title: self.frontmatter.name.as_str().to_string(),
+            hook: self.frontmatter.description.clone(),
+            r#type: self.frontmatter.r#type,
+        }
+    }
+}

crates/domain/src/ports.rs

@@ -31,6 +31,7 @@ use crate::agent::AgentManifest;
 use crate::events::DomainEvent;
 use crate::ids::{AgentId, SessionId};
 use crate::markdown::MarkdownDoc;
+use crate::memory::{Memory, MemoryIndexEntry, MemoryLink, MemorySlug};
 use crate::profile::AgentProfile;
 use crate::project::{Project, ProjectPath};
 use crate::remote::RemoteKind;
@@ -257,6 +258,46 @@ pub enum StoreError {
     Io(String),
 }
 
+/// Errors from the [`MemoryStore`].
+#[derive(Debug, Clone, PartialEq, Eq, Error)]
+pub enum MemoryError {
+    /// The requested note was not found.
+    #[error("memory not found")]
+    NotFound,
+    /// A note's frontmatter could not be parsed or validated.
+    #[error("memory frontmatter error: {0}")]
+    Frontmatter(String),
+    /// Underlying I/O error.
+    #[error("memory io failed: {0}")]
+    Io(String),
+    /// (De)serialisation of the index or another structured part failed.
+    #[error("memory serialization failed: {0}")]
+    Serialization(String),
+}
+
+/// Errors from an [`Embedder`] (LOT C, étage 2 vectoriel).
+///
+/// Best-effort by contract: a [`MemoryRecall`] that composes an embedder must
+/// **degrade**, never fail hard, on any of these — an unavailable engine or an
+/// unimplemented strategy maps to a fallback on the naïve recall (it must never
+/// surface as a hard recall error). See [`Embedder`] and the `VectorMemoryRecall`
+/// / `AdaptiveMemoryRecall` adapters.
+#[derive(Debug, Clone, PartialEq, Eq, Error)]
+pub enum EmbedderError {
+    /// The embedding engine is not installed / not reachable (e.g. a local ONNX
+    /// model file is missing, or a remote embedding server / API is unreachable).
+    #[error("embedder unavailable: {0}")]
+    Unavailable(String),
+    /// The requested strategy is not implemented yet (the concrete `localOnnx` /
+    /// `localServer` / `api` backends ship as documented stubs returning this —
+    /// never a panic). Real ONNX/HTTP integration is an explicit follow-up.
+    #[error("embedder strategy unsupported: {0}")]
+    Unsupported(String),
+    /// An I/O failure while producing embeddings.
+    #[error("embedder io failed: {0}")]
+    Io(String),
+}
+
 /// Errors from [`RemoteHost`].
 #[derive(Debug, Clone, PartialEq, Eq, Error)]
 pub enum RemoteError {
@@ -561,6 +602,130 @@ pub trait SkillStore: Send + Sync {
     ) -> Result<(), StoreError>;
 }
 
+/// CRUD for project [`Memory`] notes — the `.md` knowledge base under
+/// `.ideai/memory/` (LOT A, étage 1). Notes are the single source of truth; the
+/// aggregated `MEMORY.md` index is derived and kept in sync on every write.
+///
+/// `root` identifies the project whose `.ideai/memory/` to use; it is supplied
+/// **per call** (mirroring [`SkillStore`]) so a single store instance serves
+/// every open project.
+#[async_trait]
+pub trait MemoryStore: Send + Sync {
+    /// Lists all memory notes for `root`'s project.
+    ///
+    /// # Errors
+    /// [`MemoryError`] on failure (e.g. a malformed note's frontmatter).
+    async fn list(&self, root: &ProjectPath) -> Result<Vec<Memory>, MemoryError>;
+
+    /// Gets a memory note by slug.
+    ///
+    /// # Errors
+    /// [`MemoryError::NotFound`] if absent; [`MemoryError::Frontmatter`] if its
+    /// frontmatter is malformed.
+    async fn get(&self, root: &ProjectPath, slug: &MemorySlug) -> Result<Memory, MemoryError>;
+
+    /// Saves (creates or replaces by slug) a note: writes `<slug>.md` and upserts
+    /// its line in `MEMORY.md` idempotently.
+    ///
+    /// # Errors
+    /// [`MemoryError`] on failure.
+    async fn save(&self, root: &ProjectPath, memory: &Memory) -> Result<(), MemoryError>;
+
+    /// Deletes a note by slug, removing its line from `MEMORY.md`.
+    ///
+    /// # Errors
+    /// [`MemoryError::NotFound`] if absent.
+    async fn delete(&self, root: &ProjectPath, slug: &MemorySlug) -> Result<(), MemoryError>;
+
+    /// Reads the aggregated `MEMORY.md` index as structured entries (empty if the
+    /// index does not exist yet).
+    ///
+    /// # Errors
+    /// [`MemoryError`] on an I/O failure.
+    async fn read_index(&self, root: &ProjectPath) -> Result<Vec<MemoryIndexEntry>, MemoryError>;
+
+    /// Resolves the `[[slug]]` links emanating from `slug`'s note, **ignoring
+    /// broken links** (targets that do not resolve to an existing note).
+    ///
+    /// # Errors
+    /// [`MemoryError::NotFound`] if `slug` itself does not exist.
+    async fn resolve_links(
+        &self,
+        root: &ProjectPath,
+        slug: &MemorySlug,
+    ) -> Result<Vec<MemoryLink>, MemoryError>;
+}
+
+/// A recall request: the query text plus the token budget bounding the result
+/// (LOT B, étage 1). `text` is typically the agent's current context; the naïve
+/// adapter ignores it, but a semantic [`MemoryRecall`] (LOT C) ranks against it.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct MemoryQuery {
+    /// The recall query (often the agent's current working context).
+    pub text: String,
+    /// Approximate token budget the returned entries must fit within. A budget of
+    /// `0` yields an empty result.
+    pub token_budget: usize,
+}
+
+/// Adaptive recall of the most relevant subset of a project's memory index for a
+/// query, bounded by a token budget (LOT B, étage 1).
+///
+/// Contract (best-effort, never blocking):
+/// - an empty or absent memory yields an empty list, **never** an error;
+/// - a `token_budget` of `0` yields an empty list;
+/// - the naïve adapter ignores semantic relevance and returns the index entries
+///   in order, truncated to fit the budget.
+///
+/// **Liskov**: every implementation (`NaiveMemoryRecall`, the future
+/// `VectorMemoryRecall`) is substitutable — same emptiness/budget guarantees, only
+/// the relevance strategy differs.
+#[async_trait]
+pub trait MemoryRecall: Send + Sync {
+    /// Returns the entries most relevant to `query` for `root`'s project, capped
+    /// at `query.token_budget`.
+    ///
+    /// # Errors
+    /// [`MemoryError`] only on an unexpected I/O failure of the underlying store;
+    /// an empty or missing memory is **not** an error (returns an empty list).
+    async fn recall(
+        &self,
+        root: &ProjectPath,
+        query: &MemoryQuery,
+    ) -> Result<Vec<MemoryIndexEntry>, MemoryError>;
+}
+
+/// Produces embedding vectors for texts, driven by a declarative
+/// [`crate::profile::EmbedderProfile`] (façon §9 — adding an engine is *data*,
+/// not code: Open/Closed). The étage-2 vector recall (LOT C) composes this port
+/// to rank memory notes semantically.
+///
+/// Contract:
+/// - [`embed`](Self::embed) returns **one vector per input text**, in the same
+///   order, each of length [`dimension`](Self::dimension);
+/// - it is **best-effort from the caller's standpoint**: any failure is an
+///   [`EmbedderError`], on which a composing [`MemoryRecall`] degrades to the
+///   naïve recall — it must never bubble up as a hard recall error;
+/// - implementations are **substitutable** (Liskov): a deterministic test
+///   embedder and a real ONNX/HTTP one differ only in vector quality, not in the
+///   shape of their guarantees.
+#[async_trait]
+pub trait Embedder: Send + Sync {
+    /// Stable identifier of this embedder (e.g. `"local-onnx-minilm"`).
+    fn id(&self) -> &str;
+
+    /// Embeds each text into a `dimension()`-length vector, preserving order.
+    ///
+    /// # Errors
+    /// - [`EmbedderError::Unavailable`] if the engine is not installed/reachable,
+    /// - [`EmbedderError::Unsupported`] if the strategy is not implemented yet,
+    /// - [`EmbedderError::Io`] on an I/O failure.
+    async fn embed(&self, texts: &[String]) -> Result<Vec<Vec<f32>>, EmbedderError>;
+
+    /// The length of every vector produced by [`embed`](Self::embed).
+    fn dimension(&self) -> usize;
+}
+
 /// Persistence of the known-projects registry and the workspace.
 #[async_trait]
 pub trait ProjectStore: Send + Sync {

crates/domain/src/profile.rs

@@ -150,6 +150,107 @@ pub struct AgentProfile {
     pub session: Option<SessionStrategy>,
 }
 
+/// Embedding strategy of an [`EmbedderProfile`] (LOT C, étage 2 vectoriel).
+///
+/// Declarative, Open/Closed: a new engine family is a new variant *only* if it
+/// changes the adapter's dispatch; otherwise it is pure data on the profile
+/// (`model`, `endpoint`, …). The default product posture is [`None`](Self::None):
+/// no embedding ⇒ no heavy dependency, recall stays the naïve étage 1.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum EmbedderStrategy {
+    /// A local ONNX model run in-process (real integration is a follow-up).
+    LocalOnnx,
+    /// A local embedding server reached over HTTP (real integration is a follow-up).
+    LocalServer,
+    /// A remote embedding API (real integration is a follow-up).
+    Api,
+    /// No embedding engine: recall stays the dependency-free naïve étage 1.
+    None,
+}
+
+/// Declarative configuration for one embedding engine (LOT C, étage 2).
+///
+/// Stored in the global IDE store as `embedder.json`, mirroring `profiles.json`
+/// for [`AgentProfile`]s: adding an engine is **data, not code** (Open/Closed).
+///
+/// Invariants:
+/// - `id` and `name` non-empty,
+/// - `dimension` is non-zero (an embedder always produces fixed-length vectors).
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct EmbedderProfile {
+    /// Stable identifier (e.g. `"local-onnx-minilm"`).
+    pub id: String,
+    /// Display name.
+    pub name: String,
+    /// Embedding strategy driving which concrete adapter is used.
+    pub strategy: EmbedderStrategy,
+    /// Model identifier (e.g. an ONNX model name), when the strategy needs one.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub model: Option<String>,
+    /// Endpoint URL for a server/API strategy.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub endpoint: Option<String>,
+    /// Name of the environment variable carrying the API key (never the key
+    /// itself), for an `api` strategy.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub api_key_env: Option<String>,
+    /// Length of the vectors this engine produces.
+    pub dimension: usize,
+}
+
+impl EmbedderProfile {
+    /// Builds a validated embedder profile.
+    ///
+    /// # Errors
+    /// - [`DomainError::EmptyField`] if `id` or `name` is empty,
+    /// - [`DomainError::EmptyField`] (`"embedder.dimension"`) if `dimension` is `0`.
+    pub fn new(
+        id: impl Into<String>,
+        name: impl Into<String>,
+        strategy: EmbedderStrategy,
+        model: Option<String>,
+        endpoint: Option<String>,
+        api_key_env: Option<String>,
+        dimension: usize,
+    ) -> Result<Self, DomainError> {
+        let id = id.into();
+        let name = name.into();
+        crate::validation::non_empty(&id, "embedder.id")?;
+        crate::validation::non_empty(&name, "embedder.name")?;
+        if dimension == 0 {
+            return Err(DomainError::EmptyField {
+                field: "embedder.dimension",
+            });
+        }
+        Ok(Self {
+            id,
+            name,
+            strategy,
+            model,
+            endpoint,
+            api_key_env,
+            dimension,
+        })
+    }
+
+    /// A dependency-free default profile: strategy [`EmbedderStrategy::None`].
+    /// Recall stays the naïve étage 1 — nothing is imposed.
+    #[must_use]
+    pub fn none() -> Self {
+        Self {
+            id: "none".to_owned(),
+            name: "None".to_owned(),
+            strategy: EmbedderStrategy::None,
+            model: None,
+            endpoint: None,
+            api_key_env: None,
+            dimension: 1,
+        }
+    }
+}
+
 impl AgentProfile {
     /// Builds a validated profile.
     ///