feat: incremental planning and verified completion

[jkyberneees]

Odek can now revise plans during a turn while preserving completed work and acceptance checks.

• Add, edit, reorder, split, or replace steps, with revision reasons saved across resume.
• Require successful tool evidence for checked steps; replanning cannot silently drop requirements. Missing verification is flagged in the final answer.
• Add 11 deterministic runtime eval scenarios and update the planning and developer documentation.

Planning remains model-directed. Checks verify tool success, not whether the chosen checks fully prove task correctness.

Validation: CLI tests, affected-package race tests, all 11 eval scenarios, lint, vulnerability checks, and documentation/schema checks passed locally.

[cloudflare-workers-and-pages]

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	odek	b549d29	Commit Preview URL Branch Preview URL	Sep 18 2026, 07:41 AM