chore(build): wildcard SKILLS, claude-rules bridge symlink, link lint

The refactor scan flagged three install/lint problems. I fixed all three.

- The Makefile SKILLS list was hand-maintained and had drifted: `respond-to-cj-comments` exists on disk but wasn't installed by `make install`. I replaced the list with `$(patsubst %/SKILL.md,%,$(wildcard */SKILL.md))` so every directory containing a SKILL.md is picked up automatically.
- Cross-references in installed skills point at `../claude-rules/foo.md`. The install layout puts rules at `~/.claude/rules/`, not `~/.claude/skills/claude-rules/`, so those links resolved in the source repo and silently broke at install. I added a bridge symlink to the install target. `~/.claude/skills/claude-rules` now points at the source `claude-rules/` directory, so the same relative path works in both layouts.
- I extended `scripts/lint.sh` with a `check_md_links` function that validates `claude-rules/` cross-references in `claude-rules/*.md` and `*/SKILL.md`. Scoped narrowly on purpose: skill bodies cite illustrative file names (ADR templates, arc42 sections) that aren't real source files and would generate noise.

Verified locally: `make install` is idempotent, the bridge resolves the previously-broken link, and `bash scripts/lint.sh` is clean.

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