fix(audit-script): catch dynamic import() / require() / .d.ts FP classes (#6872 part 2)

[mrveiss]

Summary

Real audit count post-#7244 was 105 (not the masked-0 from the closure proof on #7128 — see #7244 for the postmortem). Sampling those 105 surfaced two more FP classes:

1. Dynamic ES-module imports in TS/Vue routers: `() => import('@/views/CustomDashboard.vue')`. The audit's regex required a literal space after `import` — missing the `(` form. `CustomDashboard.vue` was flagged with 0 callers despite being wired in `router/index.ts:554`.

2. TypeScript ambient declaration files (`.d.ts`). These are wired via `tsconfig.json` `include` paths, never via `import` — 0-caller reports are by design.

Fixes

`grep_count_production_callers` regex widened to also match:

Pattern	Catches
`import(...X)`	JS/TS dynamic ES-module imports
`require(...X)`	CommonJS / Vite
`importlib.(...X)`	Python dynamic
`import(...X)`	Python dynamic

New `is_ambient_type_declaration(path)` helper

Skips `*.d.ts` files in `scan()` — same pattern as #7128b's `is_entry_point_script`.

Test deltas

• +9 parametrized cases for the widened regex covering each new shape with positive + negative coverage (e.g. `logger.info('CustomDashboard usage')` correctly does NOT match).
• +4 cases for `is_ambient_type_declaration`.
• 76/76 audit-script tests pass.

Audit count drop

Stage	Count	Notes
Original (pre-fixes)	252	feature_routers.py + test_*.py + worktree-skip all conspired
After #7168 (test-prefix + registry)	165	worktree-skip still hid real count
After #7244 (entry-point + worktree-skip)	105	actual real count exposed
After this PR	85	dynamic-imports + .d.ts excluded

The remaining 85 are increasingly likely to be genuine wire-in candidates rather than FPs. Bulk-filing per #6872's original intent is now closer to safe.

Acceptance criteria

• Widen `grep_count_production_callers` for the dynamic-import patterns explicitly called out in discovery(audit-script): audit-unwired-trackers.py misses feature_routers.py registry callers (#6872 follow-up) #7109's discovery body
• Skip `.d.ts` ambient declarations
• Tests cover the new patterns + edge cases (don't false-positive on log messages mentioning the stem)
• Re-running audit shows count drop with no false-negatives introduced (sample-checked 5 of the remaining 85)

Refs #6872 (parent), #7109 (the gap was explicitly listed in this issue's body), #7244 (companion fix that exposed the real count)

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