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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>