fix: adversarial review fixes (Claude + Codex cross-model passes)

Both adversarial passes ran against the wave; every FIXABLE finding landed
with a regression test:

- probeTimeoutMs clamps to >=1ms: a fractional override floored to 0, and
  execFileSync treats timeout:0 as NO timeout — the probe that exists to
  bound hangs could hang forever (found by both models independently).
- /ship silent hook install now requires the hooks dir to live inside
  .git: with core.hooksPath (husky's COMMITTED .husky/), the chaining
  installer would have renamed the team's committed pre-push and written a
  machine-local wrapper into the working tree (found by both models).
- gstack-config gbrain-refresh accepts the "timeout" status — the last
  consumer still gating on literal "ok" (Codex); gstack-gbrain-detect's
  config-derived fields honor GBRAIN_HOME so the detection JSON can't
  report status ok alongside config_exists false (Codex).
- prepush: a remote sha absent locally (shallow clone / stale fetch) falls
  back to the merge-base/empty-tree range — scans MORE, never blocks a
  legitimate push into training users toward --no-verify.
- dashboards: curl's own 000 no longer doubles to "HTTP 000000"; the
  community dashboard flags stale snapshots like the security one; array
  sections parse via jq (the sed/grep loops truncated at the first ']');
  the no-jq marker grep tolerates whitespace.
- telemetry: multi-line redactor output nulls the field instead of
  corrupting the JSONL record; setup's hint fires only when the config key
  is genuinely unset (an explicit false is a recorded decline); the /ship
  prompt marker honors GSTACK_HOME.

Kept as designed (cross-model tension noted): Bearer stays MEDIUM in the
prepush gate — a HIGH Bearer would block every docs example; the entropy
validator can't eliminate that FP class, and MEDIUM warns visibly.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ship/SKILL.md

@@ -1225,19 +1225,33 @@ _REDACT_PREPUSH=$(~/.claude/skills/gstack/bin/gstack-config get redact_prepush_h
 _HOOK_PATH=$(git rev-parse --git-path hooks/pre-push 2>/dev/null || echo "")
 _HOOK_INSTALLED="no"
 [ -n "$_HOOK_PATH" ] && [ -f "$_HOOK_PATH" ] && grep -q "gstack-redact" "$_HOOK_PATH" 2>/dev/null && _HOOK_INSTALLED="yes"
-_PREPUSH_PROMPTED=$([ -f ~/.gstack/.redact-prepush-prompted ] && echo "yes" || echo "no")
+# Custom hooks dirs (core.hooksPath — e.g. husky's COMMITTED .husky/) must
+# never get a silent install: the chaining installer would rename the team's
+# committed hook and write a machine-local wrapper into the working tree.
+_HOOKS_DIR=$(git rev-parse --git-path hooks 2>/dev/null || echo "")
+_GIT_DIR=$(git rev-parse --absolute-git-dir 2>/dev/null || echo "")
+_HOOKS_IN_GIT_DIR="no"
+case "$_HOOKS_DIR" in
+  "$_GIT_DIR"/*|hooks|.git/hooks) _HOOKS_IN_GIT_DIR="yes" ;;
+esac
+_PREPUSH_PROMPTED=$([ -f "${GSTACK_HOME:-$HOME/.gstack}/.redact-prepush-prompted" ] && echo "yes" || echo "no")
 echo "REDACT_PREPUSH: $_REDACT_PREPUSH"
 echo "HOOK_INSTALLED: $_HOOK_INSTALLED"
+echo "HOOKS_IN_GIT_DIR: $_HOOKS_IN_GIT_DIR"
 echo "PREPUSH_PROMPTED: $_PREPUSH_PROMPTED"
 ```
 
 Branch on the echoed values:
 
-1. **`REDACT_PREPUSH: true` and `HOOK_INSTALLED: no`** — consent already
-   given; install silently (no question) and continue:
+1. **`REDACT_PREPUSH: true` and `HOOK_INSTALLED: no` and `HOOKS_IN_GIT_DIR: yes`** —
+   consent already given; install silently (no question) and continue:
    ```bash
    ~/.claude/skills/gstack/bin/gstack-redact install-prepush-hook
    ```
+   If `HOOKS_IN_GIT_DIR: no` (husky or another committed hooks dir), do NOT
+   install silently — print one line: "redact pre-push guard not installed:
+   this repo uses a custom core.hooksPath; run
+   `gstack-redact install-prepush-hook` manually if you want it chained."
 2. **`REDACT_PREPUSH` not true AND `PREPUSH_PROMPTED: no`** — one-time
    offer (fires once EVER, machine-wide). AskUserQuestion:
 
@@ -1256,7 +1270,7 @@ Branch on the echoed values:
    ALWAYS (after either answer, but NOT if the question itself failed to
    render — a failed AskUserQuestion must re-offer next time):
    ```bash
-   touch ~/.gstack/.redact-prepush-prompted
+   touch "${GSTACK_HOME:-$HOME/.gstack}/.redact-prepush-prompted"
    ```
 3. **Anything else** (declined earlier, or already installed) — continue
    without comment.

ship/SKILL.md.tmpl

@@ -388,19 +388,33 @@ _REDACT_PREPUSH=$(~/.claude/skills/gstack/bin/gstack-config get redact_prepush_h
 _HOOK_PATH=$(git rev-parse --git-path hooks/pre-push 2>/dev/null || echo "")
 _HOOK_INSTALLED="no"
 [ -n "$_HOOK_PATH" ] && [ -f "$_HOOK_PATH" ] && grep -q "gstack-redact" "$_HOOK_PATH" 2>/dev/null && _HOOK_INSTALLED="yes"
-_PREPUSH_PROMPTED=$([ -f ~/.gstack/.redact-prepush-prompted ] && echo "yes" || echo "no")
+# Custom hooks dirs (core.hooksPath — e.g. husky's COMMITTED .husky/) must
+# never get a silent install: the chaining installer would rename the team's
+# committed hook and write a machine-local wrapper into the working tree.
+_HOOKS_DIR=$(git rev-parse --git-path hooks 2>/dev/null || echo "")
+_GIT_DIR=$(git rev-parse --absolute-git-dir 2>/dev/null || echo "")
+_HOOKS_IN_GIT_DIR="no"
+case "$_HOOKS_DIR" in
+  "$_GIT_DIR"/*|hooks|.git/hooks) _HOOKS_IN_GIT_DIR="yes" ;;
+esac
+_PREPUSH_PROMPTED=$([ -f "${GSTACK_HOME:-$HOME/.gstack}/.redact-prepush-prompted" ] && echo "yes" || echo "no")
 echo "REDACT_PREPUSH: $_REDACT_PREPUSH"
 echo "HOOK_INSTALLED: $_HOOK_INSTALLED"
+echo "HOOKS_IN_GIT_DIR: $_HOOKS_IN_GIT_DIR"
 echo "PREPUSH_PROMPTED: $_PREPUSH_PROMPTED"
 ```
 
 Branch on the echoed values:
 
-1. **`REDACT_PREPUSH: true` and `HOOK_INSTALLED: no`** — consent already
-   given; install silently (no question) and continue:
+1. **`REDACT_PREPUSH: true` and `HOOK_INSTALLED: no` and `HOOKS_IN_GIT_DIR: yes`** —
+   consent already given; install silently (no question) and continue:
    ```bash
    ~/.claude/skills/gstack/bin/gstack-redact install-prepush-hook
    ```
+   If `HOOKS_IN_GIT_DIR: no` (husky or another committed hooks dir), do NOT
+   install silently — print one line: "redact pre-push guard not installed:
+   this repo uses a custom core.hooksPath; run
+   `gstack-redact install-prepush-hook` manually if you want it chained."
 2. **`REDACT_PREPUSH` not true AND `PREPUSH_PROMPTED: no`** — one-time
    offer (fires once EVER, machine-wide). AskUserQuestion:
 
@@ -419,7 +433,7 @@ Branch on the echoed values:
    ALWAYS (after either answer, but NOT if the question itself failed to
    render — a failed AskUserQuestion must re-offer next time):
    ```bash
-   touch ~/.gstack/.redact-prepush-prompted
+   touch "${GSTACK_HOME:-$HOME/.gstack}/.redact-prepush-prompted"
    ```
 3. **Anything else** (declined earlier, or already installed) — continue
    without comment.