docs(agents): harden the worktree recipe with --no-track, and name .git/config in the shared-namespace inventory

The prescribed 'git worktree add -b <branch> origin/main' writes the new
branch's upstream config (branch.NAME.remote / branch.NAME.merge) into the
one .git/config every linked worktree shares, and that write can fail AFTER
the branch is created -- leaving a branch with no worktree, a state the
recipe never mentions. --no-track skips the config write entirely and still
bases the worktree on origin/main; nothing in the agent flow needs the
upstream, because 'git push -u origin <branch>' sets one a command later.

Line-neutral in both files (AGENTS.md 1162/1162, CLAUDE.md 86/86).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EXxTW8mvPBhoHxmyPZ63de

Author: zhuangjianguo

AGENTS.md

@@ -232,8 +232,8 @@ localStorage / auth gotchas.
 11. **Worktree-first — never edit on the shared `main` checkout.** This repo is edited by **multiple agents at once**;
     the shared tree has its HEAD switched and reset *under you*, silently clobbering uncommitted work — a feature
     branch on the *shared* checkout is **not** enough (it still gets switched under you). Before your **first file
-    edit**, be in a dedicated worktree on a feature branch: `git fetch origin main &&
-    git worktree add ../objectstack-<task> -b <branch> origin/main && cd ../objectstack-<task> && pnpm install`. Two
+    edit**, be in a dedicated worktree on a feature branch: `git fetch origin main && git worktree add --no-track
+    ../objectstack-<task> -b <branch> origin/main && cd ../objectstack-<task> && pnpm install`. Two
     PreToolUse hooks **enforce** this — `.claude/hooks/guard-main-checkout.sh` blocks `Edit`/`Write`/`NotebookEdit`,
     and `.claude/hooks/guard-main-checkout-bash.sh` blocks the identical write arriving through **Bash** (`>`/`>>`
     redirection, `sed -i`, `perl -i`, `tee`, `cp`, `mv`, `rm`, `touch`) — and both check the **target file's own
@@ -394,7 +394,7 @@ git worktree add ../objectstack-<task>-cmp <ref>        # a second tree to compa
 
 **⛔ The stash is one CASE — a worktree isolates your checkout and exactly four ref
 namespaces (`HEAD`, `refs/bisect`, `refs/worktree`, `refs/rewritten`) and NOTHING else:**
-not the object store, not the config, not any other ref, so "worktrees isolate refs,
+not the object store, not `.git/config`, not any other ref, so "worktrees isolate refs,
 except stash" is exactly backwards. **`refs/remotes/*` is shared** — a sibling's fetch
 advances **your** `origin/main` (measured next door: three moves in ten minutes), so
 `git checkout origin/main -- <paths>` restores wherever that ref points **now**, possibly

CLAUDE.md

@@ -29,7 +29,7 @@ shared checkout is NOT enough** — it still gets switched under you. You MUST b
 **dedicated per-task worktree**:
 
 ```
-git fetch origin main && git worktree add ../<repo>-<task> -b <branch> origin/main && cd ../<repo>-<task> && pnpm install
+git fetch origin main && git worktree add --no-track ../<repo>-<task> -b <branch> origin/main && cd ../<repo>-<task> && pnpm install
 ```
 
 Then make all edits there. This applies **per repo**: if a task spans `framework` and