Honor canonical PR title forms

Authored-By: Codex (GPT-5) <noreply@openai.com>

README.md

@@ -18,7 +18,6 @@ Title:    [bug-x7k2m9] Fix terminal resize loss   (chore PRs: no [bug-id] prefix
 - `<bug-id>` is `bug-` followed by lowercase alphanumeric characters
 - `<kebab-description>` is lowercase alphanumeric with hyphens, starting with a letter or digit
 - When both the branch and the title carry a bug-id they **must match**
-- Titles are plain-language imperatives without Conventional Commit syntax
 - Break-glass: PRs authored by `dfritz` are exempt from all checks
 
 ## Usage
@@ -70,8 +69,7 @@ The check validates four things for every non-break-glass Agent PR:
 
 2. **Title form** — for a `role/bug` branch the title must start with
    `[bug-<id>] `. For a `chore` branch the title must have no `[bug-id]`
-   prefix. If both carry a bug-id they must match. Neither form accepts
-   Conventional Commit syntax.
+   prefix. If both carry a bug-id they must match.
 
 3. **Tracking and attribution** — on Bug-backed work, `## Tracking` contains both the literal
    `Fixes bug-<id>` automation token and the matching navigable