docs(internal): drop hardcoded home path from bat-story-eval skill (#2253)

* docs(internal): drop hardcoded home path from bat-story-eval skill

- Replace /home/julien/github/ha-mcp/worktree/uat-stories with
  $(git rev-parse --show-toplevel)/worktree/uat-stories (3 sites)
- Fix `Error: <agent>` placeholder to `{agent}`, matching the f-string
  in tests/uat/stories/scripts/ha_query.py:250

* fix(internal): resolve uat-stories worktree from the git common dir

--show-toplevel returns the *current* worktree root, so invoking the skill
from any worktree (the repo's normal flow) built the nested, nonexistent
<worktree>/worktree/uat-stories. Flagged by Codex and CodeRabbit on #2253.

---------

Co-authored-by: Sergey <sergey@example.com>

Author: sergeykad

.claude/skills/bat-story-eval/SKILL.md

@@ -33,7 +33,7 @@ If `$ARGUMENTS` is `--help` or missing `--baseline`, show usage and stop:
 ### 0a. Compute Diff
 
 ```bash
-cd /home/julien/github/ha-mcp/worktree/uat-stories
+cd "$(dirname "$(git rev-parse --path-format=absolute --git-common-dir)")/worktree/uat-stories"
 git diff <baseline>..HEAD -- src/ha_mcp/ --stat
 git diff <baseline>..HEAD -- src/ha_mcp/ --name-only
 ```
@@ -112,7 +112,7 @@ For EACH agent, run all stories against the **baseline** version. One container
 ### 1a. Start container with first story
 
 ```bash
-cd /home/julien/github/ha-mcp/worktree/uat-stories
+cd "$(dirname "$(git rev-parse --path-format=absolute --git-common-dir)")/worktree/uat-stories"
 uv run python tests/uat/stories/run_story.py \
   catalog/<first_story>.yaml \
   --agents <agent> --keep-container \
@@ -370,4 +370,4 @@ Flag >5% total size increase (directly impacts token cost per turn).
 - Reuse containers: first story starts it (`--keep-container`), rest use `--ha-url`
 - Custom story YAMLs go to `/tmp/` (ephemeral); full details reported in Step 6
 - See "Metrics" section in Step 4 for primary vs secondary metric classification
-- The working directory MUST be `/home/julien/github/ha-mcp/worktree/uat-stories` for `uv run`
+- The working directory MUST be the `worktree/uat-stories` worktree root (where `pyproject.toml` lives) for `uv run`

.claude/skills/bat-story-eval/references/evaluation-protocol.md

@@ -32,7 +32,7 @@ uv run python tests/uat/stories/scripts/ha_query.py \
 Check the exit code first. `ha_query.py` exits non-zero when the agent CLI
 itself failed, and prints `[exit N]` (plus stderr, when there is any) after
 whatever text the CLI managed to produce — `[exit 124]` for a query that hung
-past its timeout. The one non-zero exit without a marker is `Error: <agent>
+past its timeout. The one non-zero exit without a marker is `Error: {agent}
 CLI not found`, which means the agent is not installed: fix the environment
 rather than re-running. A failed query is **not a measurement**: do not score
 it as any of the three outcomes below — re-run it, and if it keeps failing,