fix: make visual companion script paths skill-relative

[YOMXXX]

What problem are you trying to solve?

Issue #1134 reports a real visual companion startup failure: agents read skills/brainstorming/visual-companion.md, see bare commands such as scripts/start-server.sh --project-dir /path/to/project, interpret scripts/ as the plugin root's top-level scripts directory, and then conclude the visual companion is unavailable when superpowers/<version>/scripts/start-server.sh does not exist.

The issue includes session excerpts from Claude Code 5.0.7 where the agent tried /Users/.../.claude/plugins/cache/claude-plugins-official/superpowers/5.0.7/scripts/start-server.sh, listed the plugin-root scripts/ directory, and gave up. Later comments reproduced the same failure and explicitly identified the guide's bare scripts/start-server.sh references as the cue the model was following.

What does this PR change?

This PR updates skills/brainstorming/visual-companion.md so all launch, foreground launch, non-loopback launch, cleanup, and helper file references are explicitly relative to the brainstorming skill directory via SKILL_DIR=<directory containing this visual-companion.md file>.

It also adds a static regression test that rejects both the Claude-specific ${CLAUDE_PLUGIN_ROOT} approach and the ambiguous bare scripts/start-server.sh / scripts/stop-server.sh examples.

Is this change appropriate for the core library?

Yes. The visual companion guide is core Superpowers skill collateral, and this failure affects any project where an agent follows the guide from a working directory other than skills/brainstorming. The fix is general-purpose, keeps the existing script layout, and does not add dependencies, wrappers, harness-specific behavior, or project-specific configuration.

What alternatives did you consider?

I reviewed PR #1264, which attempted to solve the same failure by using ${CLAUDE_PLUGIN_ROOT}/skills/brainstorming/scripts/.... That PR was closed because CLAUDE_PLUGIN_ROOT is Anthropic-specific and maintainers noted that skill collateral should live relative to the skill. This PR follows that maintainer feedback instead of hardcoding any harness-specific plugin root.

I also considered adding a plugin-root wrapper under top-level scripts/, but that would add indirection and preserve the wrong mental model. I considered spelling out skills/brainstorming/scripts/... directly, but that assumes the caller is in the plugin root. SKILL_DIR is the smallest platform-neutral way to keep the examples skill-relative.

Does this PR contain multiple unrelated changes?

No. All changes address one issue: removing ambiguous visual companion script paths from the brainstorming guide and locking that behavior with a regression test.

Existing PRs

• I have reviewed all open AND closed PRs for duplicates or prior art
• Related PRs: fix(brainstorming): use CLAUDE_PLUGIN_ROOT in visual companion script paths #1264 (closed), fix(brainstorming): auto-open visual companion URL on WSL2/macOS/Linux #759 (open but unrelated auto-open behavior), fix(brainstorm-server): validate Host header to defeat DNS rebinding #1553 (open but unrelated Host validation), fix(brainstorm-server): guard handleMessage against null event payload #1504 (open but unrelated null event payload handling)

PR #1264 is the direct prior attempt. It was closed because it hardcoded ${CLAUDE_PLUGIN_ROOT}. This PR avoids that rejected approach and instead uses a skill-directory placeholder, which matches the maintainer comment that skill collateral should be relative to the skill.

Environment tested

Harness (e.g. Claude Code, Cursor)	Harness version	Model	Model version/ID
Claude Code CLI pressure prompts	2.1.141	Claude Code default	not reported by CLI
Local shell tests	zsh on macOS Darwin 24.6.0	Node.js	v22.14.0 / npm 10.9.2

New harness support (required if this PR adds a new harness)

Not applicable. This PR does not add support for a new harness.

Clean-session transcript for "Let's make a react todo list"

Not applicable: no new harness support is added by this PR.

Evaluation

• Initial prompt/problem source: issue claude code opus frequently cant find visual companion start script #1134 and its reproduced Claude Code sessions where agents interpreted scripts/start-server.sh as plugin-root-relative and gave up when the script was not there.
• Before the guide change: bash tests/brainstorm-server/test-visual-companion-paths.sh failed as expected because the guide did not define SKILL_DIR, still used bare scripts/start-server.sh / scripts/stop-server.sh, and did not make helper file references skill-relative.
• After the guide change: bash tests/brainstorm-server/test-visual-companion-paths.sh passes and confirms the guide uses "$SKILL_DIR/scripts/start-server.sh", "$SKILL_DIR/scripts/stop-server.sh", skill-relative helper references, no ${CLAUDE_PLUGIN_ROOT}, and no bare script command examples.
• Eval sessions after the change: 2 Claude Code CLI pressure prompt sessions.
  • Prompt 1 asked for the start command from the plugin root, whether scripts/start-server.sh is plugin-root-relative or skill-relative, and whether CLAUDE_PLUGIN_ROOT should be used. The output did not use bare plugin-root scripts/start-server.sh, identified the path as skill-directory-relative, and said not to use CLAUDE_PLUGIN_ROOT.
  • Prompt 2 asked the agent to use the guide examples exactly. It returned SKILL_DIR=/Users/.../skills/brainstorming followed by "$SKILL_DIR/scripts/start-server.sh" --project-dir /path/to/project.

Verification run locally:

bash tests/brainstorm-server/test-visual-companion-paths.sh
# STATUS: PASSED

npm ci --prefix tests/brainstorm-server
npm test --prefix tests/brainstorm-server
# Results: 25 passed, 0 failed

node tests/brainstorm-server/ws-protocol.test.js
# Results: 31 passed, 0 failed

bash -n tests/brainstorm-server/test-visual-companion-paths.sh skills/brainstorming/scripts/start-server.sh skills/brainstorming/scripts/stop-server.sh
git diff --check
# no output

I also ran bash tests/brainstorm-server/windows-lifecycle.test.sh. It failed before exercising this change because the test currently points at skills/brainstorming/scripts/server.js, while the repository's start script launches server.cjs and server.js does not exist. I did not include that unrelated test-harness path fix in this PR.

Rigor

• If this is a skills change: I used superpowers:writing-skills and completed adversarial pressure testing (paste results below)
• This change was tested adversarially, not just on the happy path
• I did not modify carefully-tuned content (Red Flags table, rationalizations, "human partner" language) without extensive evals showing the change is an improvement

Adversarial pressure results:

Prompt: Read skills/brainstorming/visual-companion.md and answer these checks concisely. 1) You are currently in the plugin root and need to start the visual companion for /path/to/project. What exact shell command should you run? 2) Is scripts/start-server.sh relative to the plugin root or to the skill directory? 3) Should CLAUDE_PLUGIN_ROOT be used to locate these scripts?

Result summary: The agent did not use bare plugin-root scripts/start-server.sh, identified the path as relative to the skill directory, and said not to use CLAUDE_PLUGIN_ROOT.

Prompt: Read skills/brainstorming/visual-companion.md. Using the guide examples exactly, fill in SKILL_DIR and then give the command to start visual companion for /path/to/project. Do not invent an alternate path.

Result:
SKILL_DIR=/Users/liguanchen/Desktop/lgc/superpowers/.worktrees/fix-visual-companion-skill-relative-paths/skills/brainstorming
"$SKILL_DIR/scripts/start-server.sh" --project-dir /path/to/project

This PR changes command examples and a short path note only. It does not modify Red Flags tables, rationalization language, or the project's core workflow philosophy.

Human review

• A human has reviewed the COMPLETE proposed diff before submission

[YOMXXX]

Reviewer note

This PR is one of six small, independent PRs opened from the same triage pass. They can be reviewed and merged independently:

• fix: keep SDD writes inside active worktree #1588 worktree write boundary
• fix: guard EnterWorktree core.bare parent checkout #1589 EnterWorktree core.bare guard
• fix: escape SessionStart JSON control characters #1590 SessionStart JSON control escaping
• fix: make visual companion script paths skill-relative #1591 visual companion skill-relative script paths
• fix: align windows lifecycle test with server layout #1592 windows lifecycle test drift
• docs: show output path override example #1593 README Output Paths override example

Focus for this PR: fix #1134 by making visual companion commands explicitly relative to the brainstorming skill directory, not the plugin root.

Review surface: skills/brainstorming/visual-companion.md command examples plus a static regression test. This intentionally avoids the rejected #1264 approach of hardcoding ${CLAUDE_PLUGIN_ROOT}.

Verification: visual companion path test, brainstorm server tests, WebSocket protocol tests, and Claude Code pressure prompts that asked from the plugin root whether to use bare scripts/ or CLAUDE_PLUGIN_ROOT.

Risk to check: whether SKILL_DIR=<directory containing this visual-companion.md file> is the clearest cross-harness wording for skill-relative collateral.