test(scripts): add bats harness for audit + install-ai edge cases

Adds scripts/tests/audit.bats (6 tests) and scripts/tests/install-ai.bats (5 tests) covering the three destructive edge cases that the fold-epic test plan deferred yesterday: audit --apply --force clobbering a tracked dirty .ai/, audit's loop continuing past a missing-.ai/ project, and install-ai's interactive fzf-pick form. The first two go alongside happy-path sanity (clean sweep, drift detection, --apply convergence, dirty-skip); install-ai gets happy-path with explicit PROJECT, --track gitkeep stubs, refusal on existing .ai/, and notes.org placeholder substitution.

Strategy: redirect HOME to a per-test mktemp dir, scaffold synthetic project trees under HOME/code/, and run the real scripts against them. The canonical source stays the real one (resolved relative to each script's own location), so tests exercise the production rsync paths without copying canonical content. Use PATH stubs for fzf and find to cover the interactive and race-condition edges.

Makefile test: target extended with a bats stanza; description updated to "Run all test suites (pytest + ERT + bats)". make test now runs 352 green (296 pytest + 22 lint-org ERT + 23 todo-cleanup ERT + 6 audit bats + 5 install-ai bats), up from 341.

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