[nick2781]

Draft PRs currently start native builds alongside older acceptance runs, and becoming ready does not trigger fresh source validation. Add a separate draft preview so later modules can be reviewed without consuming native runners ahead of the oldest ready PR. Consolidate the agreed contributor rules in AGENTS.md.

Only boolean draft=true selects the non-required CI - draft preview context and skips native jobs. Ready PRs get fresh source checks; merge candidates retain the full twelve-profile matrix and CI - required. Malformed metadata fails conservatively. Existing native commands, caches, limits and branch protection are unchanged. Preview success never establishes merge acceptance; a fresh ready-for-review run at the intended head remains required.

Rules record English Conventional Commits and branch names, ordered root-controlled admission, parallel local work, synchronized bilingual documentation, canonical emitted-page checks, local-only raw evidence and the selected co-located plugin layout. No plugin implementation or lifecycle change is included.

Validation:

• Prepared on accepted main 1254121 after PRs refactor(sdk)!: replace legacy utility macros with standard calls #112–ci(scope): classify exact test READMEs as documentation #115 merged in order.
• Rebased tree: all 105 policy tests passed; full Nimbus passed with 129 emitted HTML pages and 237 internal references.
• Earlier integrated checks passed 105 policy tests, YAML parsing, Node syntax and focused workflow-equivalence checks. Actionlint is unavailable locally.
• Hosted draft behavior remains unverified. This initial ready PR must pass normal source and full merge-candidate checks; the next draft will verify preview and fresh ready execution before queue admission.

No native or performance acceptance is claimed by local policy/documentation tests.