fix: reconcile ordered plain task plans

[EvanProgramming]

Fixes #140

What changed

• Mark plain-string TaskLists with a durable ordered-plan identity and reconcile only uniquely compatible receipts.
• Persist inferred receipt evidence/checkpoints and complete successful read, test, write, and Git steps without requiring TaskDone.
• Preserve exact action/argument matching, restart recovery, and visible unmatched-receipt reasons.
• Add CLI, restart, duplicate-observation, and genuinely unmatched regression coverage.

Validation

• python -m unittest tests.test_task_consistency -v (17 passed)
• make check
• make docs-check
• git diff --check
• Full local make test-core reached all 190 tests; loopback webhook tests and isolated wheel build are sandbox/offline blocked here, with CI as the authoritative gate.