fix: parse estimates before terminal punctuation

[vycdev2]

Summary

• Recognize compact estimate tags when sentence-ending punctuation follows the duration.
• Keep strict boundaries so estimate-like prefixes inside longer tokens remain ignored.
• Add regression coverage for compact and explicit estimate forms and document the user-visible statistics fix.

Verification

• Focused estimate regression test was confirmed RED before implementation and GREEN afterward.
• npm install — passed with existing deprecation and vulnerability warnings.
• npx mocha -r ts-node/register test/estimate.spec.ts --exit — passed.
• npm test — passed (135 tests).
• npm run compile — passed.
• npm run format:check — passed.
• git diff --check — passed.

Risk

Low. Matching expands only at a terminal punctuation boundary; longer estimate-like tokens such as @2h.foo remain rejected.

This was generated by an AI agent (vycdev2). Please verify any changes before merging or applying.