feat(skills): make skills loadable, and audit for it

[MCamner]

Two commits: wire this repo's skills up, then stop the same gap coming back.

The gap

The MQ convention keeps skills in <repo>/skills/ and indexes them in SKILLS.md. Claude Code discovers skills somewhere else: <repo>/.claude/skills/. Nothing checked those two against each other, so the entire stack carried skills no agent could load:

repo	unreachable
mq-image-analyze	13
mq-mcp	12
mq-agent	8
macos-scripts	8
repo-signal	7
mq-hal	7
mq-ums	7
atlas-one	1

63 in total. mq-skills.py audit called every one of them ok, indexed.

The one that looked wired here was a false positive: .claude/commands/mqlaunch-command-surface.md is a slash command whose whole body is an instruction to go read skills/mqlaunch-command-surface/SKILL.md. That works when someone types the command; automatic triggering on the description — the thing that makes a skill worth having — never happened.

The fix

Relative symlinks from .claude/skills/ into skills/ and .agents/skills/, mirroring how .agents/skills/pdf was already wired here by hand. The other seven repos get the same treatment in their own commits.

The check

mq-skills.py audit prints a third column, and validate warns on two new states:

macos-scripts: 7 skill(s), 7 indexed, 7 discoverable

• not-discoverable — no entry under .claude/skills
• broken-link — an entry with no SKILL.md behind it

Fix hints name the actual remedy rather than pointing at SKILL.md again.

Step 12 of the smoke test builds a scratch repo with one skill and asserts it is reported while unlinked and not reported once linked, so the check tracks reality instead of always complaining.

Verification

The linked skills became available in this session the moment the links existed — no restart, which is the proof that matters more than the audit column.

$ ./tests/skills-repos-smoke.sh
[11/12] audit reports whether each skill is discoverable by Claude Code
[12/12] an unlinked skill is reported, and a linked one is not
OK: skills and repos command surface smoke test passed

$ python3 tools/scripts/mq-skills.py validate --ecosystem
Ecosystem validation: 8 repo(s)
Validation passed: 0 warning(s)

$ MACOS_SCRIPTS_HOME="$PWD" MQ_NO_TUI=1 ./tools/scripts/test-all.sh
[PASS] Shell lint passed at warning severity (197 files)
[PASS] All selftest checks passed.

🤖 Generated with Claude Code