feat(rules): add triggers.md for cross-project launch phrases

Adds claude-rules/triggers.md as the home for phrases the user says from any cwd to invoke a cross-project action. First entry: "launch project X" → run the ai script in single-project mode targeting the matched basename. Ambiguity handling: list candidates and ask rather than guess.

The trigger phrases already in protocols.org ("Let's run the [X] workflow", "Wrap it up") are project-scoped. They assume an active .ai/ session. Cross-project launchers don't fit that layer; they need to work from any cwd, including outside any project. None of the existing claude-rules files (commits.md, testing.md, verification.md, subagents.md, interaction.md, cross-project.md, todo-format.md) had a clean fit either. A new file is the smallest architectural change.

Makefile picks up new claude-rules/*.md files via wildcard, so no Makefile change needed. make install created the symlink at ~/.claude/rules/triggers.md; make doctor reports 39/0/0.

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