fix: execute improve plans

[vnedyalk0v]

Summary

• Align promotion docs with the repository merge settings.
• Sanitize /flow-check command return data so raw stdout/stderr are not returned.
• Bound Codeflow timeout config in schema and runtime validation.
• Mark the stale /flow-watch ADR default as superseded and mark plans 001-004 DONE.

Verification

• npm run check
• git diff --check origin/dev..HEAD

Self-review

• Confirmed the PR is branched from dev and does not target a reserved branch.
• Confirmed no dependencies, release automation, publishing, or runtime behavior outside the plan scope were added.
• Confirmed plan 003 uses local constants instead of a new validation layer.

Related issues and PRs

• Related issues: none provided.
• Based on improve plans added in PR docs: add improve implementation plans #54.

Review comments addressed

• None.

Decisions made

• Kept plan execution as separate commits and added a final plan-index status commit.

Known risks or follow-up work

• Automatic review may still request wording or API-surface adjustments.