feat(plugin): resolve session project from git remote, not a pinned project_id

The SessionStart hook asked for a project_id via plugin userConfig, which pins
one install to a single project — wrong for an operator working across many
repos/projects. Resolve the active project server-side from the working repo's
git remote instead (a stable identifier, not a dir-name guess).

- repo_bindings table (migration 0064) + RepoBinding model: (user, repo_key) ->
  project, FKs CASCADE.
- services/repo_bindings: normalize_repo_key collapses ssh/https/scp/creds/port/
  .git to host/owner/repo; resolve/set/list/delete.
- GET /api/plugin/context takes ?repo=<remote>; unbound repo -> a "bind this
  repo" hint with a ready bind_repo() call. project_id kept as manual override.
- MCP tools: bind_repo / list_repo_bindings / unbind_repo.
- Hook sends ?repo=$(git remote get-url origin) URL-encoded; all project_id
  handling removed. plugin.json drops the project_id userConfig (0.1.2 -> 0.1.3).
- Tests: normalize equivalence classes + unbound-hint rendering.

Refs task 755 (Scribe-as-plugin push channel).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/scribe/mcp/tools/__init__.py

@@ -5,7 +5,7 @@ to a FastMCP instance. `register_all(mcp)` is the single entry point called
 from `mcp.server.build_mcp_server`.
 """
 from scribe.mcp.tools import (
-    entities, events, milestones, notes, processes, projects, recent, rulebooks, search, tags, tasks, trash,
+    entities, events, milestones, notes, processes, projects, recent, repos, rulebooks, search, tags, tasks, trash,
 )
 
 
@@ -20,6 +20,7 @@ def register_all(mcp) -> None:
     tags.register(mcp)
     recent.register(mcp)
     entities.register(mcp)
+    repos.register(mcp)
     processes.register(mcp)
     rulebooks.register(mcp)
     trash.register(mcp)

src/scribe/mcp/tools/repos.py

@@ -0,0 +1,68 @@
+"""Repo -> project binding MCP tools.
+
+Let the operator map the working git repository to a Scribe project so the
+SessionStart hook auto-loads that project's context — without pinning a project
+id in plugin config (which would force a single project for every repo). Run
+`bind_repo` once per repo; the binding is keyed on the normalized git remote, so
+it survives re-clones and ssh/https URL differences.
+"""
+from __future__ import annotations
+
+from scribe.mcp._context import current_user_id
+from scribe.services import projects as projects_svc
+from scribe.services import repo_bindings as repo_bindings_svc
+
+
+async def bind_repo(repo_url: str, project_id: int) -> dict:
+    """Bind a git repository to a Scribe project for session-start context.
+
+    After this, any session started in that repo auto-loads the project's
+    context (the SessionStart hook sends the repo's remote; the server resolves
+    it here). Idempotent — re-binding the same repo updates the target project.
+
+    Args:
+        repo_url: the repo's git remote (e.g. the output of
+            `git remote get-url origin` — ssh or https form, both work).
+        project_id: the Scribe project this repo represents.
+    """
+    uid = current_user_id()
+    project = await projects_svc.get_project(uid, project_id)
+    if project is None:
+        raise ValueError(f"project {project_id} not found")
+    binding = await repo_bindings_svc.set_binding(uid, repo_url, project_id)
+    return {
+        "repo_key": binding.repo_key,
+        "project_id": binding.project_id,
+        "project_title": project.title,
+        "message": f"Bound `{binding.repo_key}` -> {project.title} (id {project.id}).",
+    }
+
+
+async def list_repo_bindings() -> dict:
+    """List every repo -> project binding for the current user."""
+    uid = current_user_id()
+    bindings = await repo_bindings_svc.list_bindings(uid)
+    return {"bindings": [b.to_dict() for b in bindings]}
+
+
+async def unbind_repo(repo_url: str) -> dict:
+    """Remove a repo's binding. Sessions there fall back to standing rules only.
+
+    Args:
+        repo_url: the repo's git remote (same form used to bind it).
+    """
+    uid = current_user_id()
+    removed = await repo_bindings_svc.delete_binding(uid, repo_url)
+    key = repo_bindings_svc.normalize_repo_key(repo_url)
+    return {
+        "removed": removed,
+        "repo_key": key,
+        "message": (
+            f"Unbound `{key}`." if removed else f"No binding found for `{key}`."
+        ),
+    }
+
+
+def register(mcp) -> None:
+    for fn in (bind_repo, list_repo_bindings, unbind_repo):
+        mcp.tool(name=fn.__name__)(fn)

src/scribe/models/__init__.py

@@ -40,3 +40,4 @@ from scribe.models.user_profile import UserProfile  # noqa: E402, F401
 from scribe.models.rulebook import (  # noqa: E402, F401
     Rulebook, RulebookTopic, Rule, project_rulebook_subscriptions,
 )
+from scribe.models.repo_binding import RepoBinding  # noqa: E402, F401

src/scribe/models/repo_binding.py

@@ -0,0 +1,40 @@
+from sqlalchemy import ForeignKey, Integer, Text, UniqueConstraint
+from sqlalchemy.orm import Mapped, mapped_column
+
+from scribe.models import Base
+from scribe.models.base import TimestampMixin
+
+
+class RepoBinding(Base, TimestampMixin):
+    """Maps a git repository to the Scribe project it represents.
+
+    The SessionStart hook sends the working repo's normalized remote
+    (`repo_key`, e.g. ``git.fabledsword.com/bvandeusen/fabledscribe``) and the
+    server resolves it to a project — so the operator can work across many
+    repos/projects without pinning a project id in plugin config. The key is a
+    *stable identifier* (the git remote), not a dir-name heuristic.
+    """
+
+    __tablename__ = "repo_bindings"
+    __table_args__ = (
+        UniqueConstraint("user_id", "repo_key", name="uq_repo_bindings_user_repo"),
+    )
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    user_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    project_id: Mapped[int] = mapped_column(
+        Integer, ForeignKey("projects.id", ondelete="CASCADE"), nullable=False
+    )
+    repo_key: Mapped[str] = mapped_column(Text, nullable=False)
+
+    def to_dict(self) -> dict:
+        return {
+            "id": self.id,
+            "user_id": self.user_id,
+            "project_id": self.project_id,
+            "repo_key": self.repo_key,
+            "created_at": self.created_at.isoformat(),
+            "updated_at": self.updated_at.isoformat(),
+        }

src/scribe/routes/plugin.py

@@ -12,6 +12,7 @@ from quart import Blueprint, g, jsonify, request
 
 from scribe.auth import admin_required, get_current_user_id, login_required
 from scribe.services import plugin_context as plugin_ctx_svc
+from scribe.services import repo_bindings as repo_bindings_svc
 from scribe.services.settings import get_admin_setting, set_setting
 
 plugin_bp = Blueprint("plugin", __name__, url_prefix="/api/plugin")
@@ -25,16 +26,33 @@ _MARKETPLACE_KEY = "plugin_marketplace_url"
 @plugin_bp.get("/context")
 @login_required
 async def session_context():
-    """Return SessionStart context (always-on rules + optional project).
+    """Return SessionStart context (always-on rules + active project).
 
-    Query: project_id (optional int) — when set, includes that project's goal
-    and open-task count. The hook passes the bound project's id here.
+    Query:
+        repo (optional str) — the working repo's git remote. The server
+            resolves it to the bound project (see services/repo_bindings); an
+            unbound repo yields a "bind this repo" hint instead. This is how the
+            active project is determined — the plugin never pins a project id.
+        project_id (optional int) — explicit override, mainly for manual/ad-hoc
+            curl testing; takes precedence over `repo` when set.
     """
     try:
         project_id = int(request.args.get("project_id", 0) or 0)
     except (TypeError, ValueError):
         project_id = 0
-    result = await plugin_ctx_svc.build_session_context(g.user.id, project_id)
+
+    unbound_repo = ""
+    repo = (request.args.get("repo") or "").strip()
+    if repo and not project_id:
+        resolved = await repo_bindings_svc.resolve_project(g.user.id, repo)
+        if resolved:
+            project_id = resolved
+        else:
+            unbound_repo = repo_bindings_svc.normalize_repo_key(repo)
+
+    result = await plugin_ctx_svc.build_session_context(
+        g.user.id, project_id, unbound_repo=unbound_repo
+    )
     return jsonify(result)
 
 

src/scribe/services/plugin_context.py

@@ -40,9 +40,19 @@ async def _topic_titles(topic_ids: set[int]) -> dict[int, str]:
         return {tid: title for tid, title in rows.all()}
 
 
-async def build_session_context(user_id: int, project_id: int = 0) -> dict:
+async def build_session_context(
+    user_id: int, project_id: int = 0, unbound_repo: str = ""
+) -> dict:
     """Render the SessionStart context for a user, optionally project-scoped.
 
+    Args:
+        user_id: the operator.
+        project_id: the resolved active project (0 = none). The endpoint
+            resolves this from the working repo's remote, not from config.
+        unbound_repo: when the hook sent a repo remote that maps to no project,
+            its normalized key — triggers a one-line "bind this repo" hint so
+            the binding is self-healing.
+
     Returns {"context": str, "rule_count": int, "project": dict | None}.
     `context` is markdown ready to drop into `additionalContext`; it is capped
     at _MAX_CHARS with an explicit truncation note so the hook can pass it
@@ -86,6 +96,16 @@ async def build_session_context(user_id: int, project_id: int = 0) -> dict:
                 f"Goal: {goal[:200]}" if goal else "",
                 f"Open todo tasks: {open_count}",
             ]
+    elif unbound_repo:
+        lines += [
+            "",
+            "## Repository not yet bound",
+            f"This repo (`{unbound_repo}`) isn't mapped to a Scribe project, so "
+            "no project context was loaded. Bind it once with "
+            f'`bind_repo(repo_url="{unbound_repo}", project_id=<id>)` '
+            "(call `list_projects` to find the id) and future sessions here will "
+            "auto-load that project's context.",
+        ]
 
     lines += [
         "",

src/scribe/services/repo_bindings.py

@@ -0,0 +1,119 @@
+"""Repo -> project binding resolution.
+
+The SessionStart hook sends the working repo's git remote; this module
+normalizes it to a stable `repo_key` and resolves it to a project id. The key
+deliberately collapses ssh/https forms of the same remote so the operator binds
+a repo once regardless of how it's cloned.
+"""
+from __future__ import annotations
+
+import re
+
+from sqlalchemy import select
+
+from scribe.models import async_session
+from scribe.models.repo_binding import RepoBinding
+
+
+def normalize_repo_key(raw: str) -> str:
+    """Reduce a git remote URL to a stable, scheme-agnostic ``host/owner/repo``.
+
+    Collapses the equivalent clone URLs to one key, e.g.::
+
+        git@git.fabledsword.com:bvandeusen/FabledScribe.git
+        https://git.fabledsword.com/bvandeusen/fabledscribe.git
+        ssh://git@git.fabledsword.com:22/bvandeusen/fabledscribe
+
+    all normalize to ``git.fabledsword.com/bvandeusen/fabledscribe``.
+
+    Returns "" for empty/garbage input so callers can treat it as "no repo".
+    """
+    s = (raw or "").strip()
+    if not s:
+        return ""
+
+    # scp-like syntax: git@host:owner/repo(.git) -> ssh://host/owner/repo
+    scp = re.match(r"^[^/@]+@([^:/]+):(.+)$", s)
+    if scp and "://" not in s:
+        s = f"//{scp.group(1)}/{scp.group(2)}"
+    else:
+        # strip an explicit scheme (https://, http://, ssh://, git://, git+ssh://)
+        s = re.sub(r"^[a-z][a-z0-9+.\-]*://", "//", s, flags=re.IGNORECASE)
+        if not s.startswith("//"):
+            s = "//" + s
+
+    body = s[2:]  # drop leading //
+    # strip userinfo (user@ or user:pass@) on the authority
+    body = re.sub(r"^[^/]*@", "", body)
+    # drop an explicit port on the host (host:22/...)
+    body = re.sub(r"^([^/:]+):\d+", r"\1", body)
+    # strip trailing .git and surrounding slashes
+    body = body.strip("/")
+    if body.endswith(".git"):
+        body = body[:-4]
+    return body.lower()
+
+
+async def resolve_project(user_id: int, raw_repo: str) -> int | None:
+    """Return the bound project id for a repo remote, or None if unbound."""
+    key = normalize_repo_key(raw_repo)
+    if not key:
+        return None
+    async with async_session() as session:
+        row = await session.execute(
+            select(RepoBinding.project_id).where(
+                RepoBinding.user_id == user_id, RepoBinding.repo_key == key
+            )
+        )
+        return row.scalar_one_or_none()
+
+
+async def set_binding(user_id: int, raw_repo: str, project_id: int) -> RepoBinding:
+    """Create or update the binding for a repo. Idempotent on (user, repo_key)."""
+    key = normalize_repo_key(raw_repo)
+    if not key:
+        raise ValueError("repo remote is empty or unparseable")
+    async with async_session() as session:
+        existing = await session.execute(
+            select(RepoBinding).where(
+                RepoBinding.user_id == user_id, RepoBinding.repo_key == key
+            )
+        )
+        binding = existing.scalar_one_or_none()
+        if binding is None:
+            binding = RepoBinding(user_id=user_id, repo_key=key, project_id=project_id)
+            session.add(binding)
+        else:
+            binding.project_id = project_id
+        await session.commit()
+        await session.refresh(binding)
+        return binding
+
+
+async def list_bindings(user_id: int) -> list[RepoBinding]:
+    async with async_session() as session:
+        rows = await session.execute(
+            select(RepoBinding)
+            .where(RepoBinding.user_id == user_id)
+            .order_by(RepoBinding.repo_key)
+        )
+        return list(rows.scalars().all())
+
+
+async def delete_binding(user_id: int, raw_repo: str) -> bool:
+    """Remove a repo's binding. Returns True if a row was deleted."""
+    key = normalize_repo_key(raw_repo)
+    if not key:
+        return False
+    async with async_session() as session:
+        row = await session.execute(
+            select(RepoBinding).where(
+                RepoBinding.user_id == user_id, RepoBinding.repo_key == key
+            )
+        )
+        binding = row.scalar_one_or_none()
+        if binding is None:
+            return False
+        await session.delete(binding)
+        await session.commit()
+        return True