fix(setup-gbrain): smoke test command + MCP user scope with absolute path

Three Step 5a/9 defects found running /setup-gbrain end-to-end:

1. Step 9 smoke test used `gbrain put_page --title ... --tags ...`,
   which doesn't exist. The real command is `gbrain put <slug>` with
   body piped on stdin. Updated to match.

2. Step 5a registered MCP with `claude mcp add gbrain -- gbrain serve`.
   Default scope is local (per-workspace), so other projects never saw
   gbrain. Cross-session memory is the whole point — user scope is
   correct.

3. Step 5a passed `gbrain` by bare name, relying on PATH being resolved
   when Claude Code spawns the subprocess. Fragile across shell configs.
   Use absolute path from `command -v gbrain` with ~/.bun/bin/gbrain
   fallback.

Also: remove any stale local-scope registration before re-adding, and
tell the user that open Claude Code sessions need a restart to see
the new mcp__gbrain__* tools (loaded at session start, not mid-session).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

setup-gbrain/SKILL.md

@@ -1283,17 +1283,33 @@ doctor output and STOP.
 Only if `which claude` resolves. Ask: "Give Claude Code a typed tool surface
 for gbrain? (recommended yes)"
 
-If yes:
+If yes, register at **user scope** with an **absolute path** to the gbrain
+binary. User scope makes the MCP available in every Claude Code session on
+this machine, not just the current workspace. Absolute path avoids PATH
+resolution issues when Claude Code spawns `gbrain serve` as a subprocess.
 
 ```bash
-claude mcp add gbrain -- gbrain serve
-claude mcp list | grep gbrain  # verify
+GBRAIN_BIN=$(command -v gbrain)
+[ -z "$GBRAIN_BIN" ] && GBRAIN_BIN="$HOME/.bun/bin/gbrain"
+claude mcp add --scope user gbrain -- "$GBRAIN_BIN" serve
+claude mcp list | grep gbrain  # verify: should show "✓ Connected"
+```
+
+If the user already had a local-scope registration from an earlier run,
+remove it first so both scopes don't conflict:
+```bash
+claude mcp remove gbrain 2>/dev/null || true
 ```
 
 If `claude` is not on PATH: emit "MCP registration skipped — this skill is
 Claude-Code-targeted; register `gbrain serve` in your agent's MCP config
 manually." Continue to step 6.
 
+**Heads-up for the user:** an already-open Claude Code session will not
+pick up the new MCP tools until restart. Tell them: "Restart any open
+Claude Code sessions to see `mcp__gbrain__*` tools — they're loaded at
+session start, not mid-session."
+
 ---
 
 ## Step 6: Per-remote policy (D3 triad, gated repo-import)
@@ -1368,9 +1384,9 @@ Find-and-replace (or append) this section in CLAUDE.md:
 ## Step 9: Smoke test
 
 ```bash
-gbrain put_page --title "setup-gbrain smoke test" --tags "meta" \
-  <<<"Set up on $(date)"
-gbrain search "smoke test" | grep -i "setup-gbrain smoke test"
+SLUG="setup-gbrain-smoke-test-$(date +%s)"
+echo "Set up on $(date). Smoke test for /setup-gbrain." | gbrain put "$SLUG"
+gbrain search "smoke test" | grep -i "$SLUG"
 ```
 
 Confirms the round trip. On failure, surface `gbrain doctor --json` output

setup-gbrain/SKILL.md.tmpl

@@ -285,17 +285,33 @@ doctor output and STOP.
 Only if `which claude` resolves. Ask: "Give Claude Code a typed tool surface
 for gbrain? (recommended yes)"
 
-If yes:
+If yes, register at **user scope** with an **absolute path** to the gbrain
+binary. User scope makes the MCP available in every Claude Code session on
+this machine, not just the current workspace. Absolute path avoids PATH
+resolution issues when Claude Code spawns `gbrain serve` as a subprocess.
 
 ```bash
-claude mcp add gbrain -- gbrain serve
-claude mcp list | grep gbrain  # verify
+GBRAIN_BIN=$(command -v gbrain)
+[ -z "$GBRAIN_BIN" ] && GBRAIN_BIN="$HOME/.bun/bin/gbrain"
+claude mcp add --scope user gbrain -- "$GBRAIN_BIN" serve
+claude mcp list | grep gbrain  # verify: should show "✓ Connected"
+```
+
+If the user already had a local-scope registration from an earlier run,
+remove it first so both scopes don't conflict:
+```bash
+claude mcp remove gbrain 2>/dev/null || true
 ```
 
 If `claude` is not on PATH: emit "MCP registration skipped — this skill is
 Claude-Code-targeted; register `gbrain serve` in your agent's MCP config
 manually." Continue to step 6.
 
+**Heads-up for the user:** an already-open Claude Code session will not
+pick up the new MCP tools until restart. Tell them: "Restart any open
+Claude Code sessions to see `mcp__gbrain__*` tools — they're loaded at
+session start, not mid-session."
+
 ---
 
 ## Step 6: Per-remote policy (D3 triad, gated repo-import)
@@ -370,9 +386,9 @@ Find-and-replace (or append) this section in CLAUDE.md:
 ## Step 9: Smoke test
 
 ```bash
-gbrain put_page --title "setup-gbrain smoke test" --tags "meta" \
-  <<<"Set up on $(date)"
-gbrain search "smoke test" | grep -i "setup-gbrain smoke test"
+SLUG="setup-gbrain-smoke-test-$(date +%s)"
+echo "Set up on $(date). Smoke test for /setup-gbrain." | gbrain put "$SLUG"
+gbrain search "smoke test" | grep -i "$SLUG"
 ```
 
 Confirms the round trip. On failure, surface `gbrain doctor --json` output