fix: seventeen reliability fixes

AGENTS.md

@@ -141,7 +141,9 @@ host is recallable from all of them. Not installed yet? Follow
   with no project and global ones, and says which in `scope`. When you tag by hand (the CLI, or another
   project), use `project:<id>`, where `<id>` is the `project` field of the
   `briefing` result (CLI: `memesh briefing --json`). The injected block shows
-  only the readable name; a tag with the plain repository name is a different
+  only the readable name. `remember` stores a plain-name tag for the call's
+  own project as the id (and says so in `retagged`), but a plain name for any
+  other project, or on a memory already filed under it, stays a different
   scope that this project's sessions never see.
 - **A mistake with a known cause and fix is a `learn` call** (it creates a
   `lesson_learned`, which later sessions show as a lesson). A choice between

CODEMAP.md

@@ -75,6 +75,7 @@ docs/                # ARCHITECTURE.md, api/API_REFERENCE.md
 - `getProjectName()` (git-remote-slug → repo-root → cwd-basename, cached) → `src/core/paths.ts`
   (build-generated as `scripts/hooks/_generated/core-paths.js`, then imported by `_shared.js`)
 - List / merge / rename `project:*` tags → `src/core/project-tags.ts` (backs `memesh kg rename-project`)
+- Find plain project tags that share their name with a project id (doctor's `project-identity-split`) → `src/core/project-identity-split.ts`
 - Heuristic relation backfill (orphan connector) → `src/core/kg-backfill.ts`
 
 ### Config / self-update