Add canonical task-report archive and finalize-before-teardown gate

[prandelicious]

Summary

• Adds bin/fm-report-finalize.sh to archive scout reports and ship delivery receipts under data/reports/<project>/<task-id>.md, record report_archive= in task meta, and regenerate a per-project INDEX.md.
• Requires finalization for ordinary ship and scout tasks in bin/fm-teardown.sh before destructive cleanup (--force still skips).
• Clarifies scout brief report destinations as private FM_HOME paths; updates fleet snapshot to prefer archived paths; documents the contract in docs/task-report-archive.md.

Test plan

• bash tests/fm-report-finalize.test.sh
• bash tests/fm-decision-hold-lifecycle.test.sh
• bin/fm-lint.sh
• no-mistakes through lint (push used fork remote due to upstream permission)

Design tradeoffs

• Working reports stay at data/<id>/report.md during the task; finalize copies into the archive without mass-moving historical reports.
• Ship tasks get a short synthesized delivery receipt when no working report exists, rather than requiring a verbose report.
• Post-teardown decision holds can resolve origins via archived report paths when working copies are absent.

Made with Cursor