fix: enforce explicit dispatch confirmation

[Gandy2025]

Summary

• reject generic acknowledgements unless the same message names every frontier item and primary agent
• bind continuation and final reconciliation to the original parent chat
• require terminal ledger outcomes before the final receipt

Scope

Includes only the run-with-first-tree behavioral contract, regression checks, changelog, and synchronized English/Chinese documentation. No graph schema, builder, CLI, or release behavior changes.

Validation

• Skill structure validation
• Full unit test suite: 85 passed, 1 filesystem skip
• Deterministic Floor: 5/5 PASS
• Python compileall
• Ruff lint and format checks
• Agent Skills validation
• Pinned installer discovery with skills 1.5.22
• skills latest discovery smoke
• git diff --check

Safety and compatibility

• No credentials, personal data, model transcripts, or live-run artifacts
• English canonical docs and Chinese mirrors are synchronized when affected
• Support and release claims do not exceed the evidence collected
• No breaking graph or installer contract change