v0.7.0: --notify-cmd run-summary notification hook

[Codevena]

Summary

Run-summary notifications for unattended fixbuddy runs, plus roadmap cleanup — releasing as v0.7.0.

• --notify-cmd <cmd> (repeatable) + additive config key notify_cmd, mirroring the --check-cmd trust model (operator-trusted, shell-eval, launch directory). Fires once after the final summary — including after a crash-abort (FIXBUDDY_ABORTED=true). Each command receives FIXBUDDY_* env vars (counts, log dir) and a human-readable summary on stdin, so ntfy, a Slack webhook curl -d @-, or mail work without plumbing. Failures warn but never change fixbuddy's exit code; output lands in $log_root/notify.log. Intentionally not fired for --dry-run, empty queues, or Ctrl-C.
• Roadmap retired: notifications ship here; explicit resume mode is intentionally not built — the label system already resumes interrupted runs (new FAQ entry documents this).
• Six new integration tests (20 total): env/stdin contract, failure isolation, blocked + aborted counts, config key, dry-run exclusion.
• Release housekeeping: v0.7.0 bumps, CHANGELOG, fresh SHA256SUMS.

Test Plan

• bash -n (each script) + shellcheck (default severity) clean
• tests/integration.sh: 20 passed, 0 failed (offline)
• Review gate: Codex PASS + Claude PASS (zero CRITICAL/WARN)
• CI green on this PR

Release steps after merge

1. git tag v0.7.0 && git push origin v0.7.0
2. git tag -f v1 v0.7.0 && git push origin v1 --force
3. gh release create v0.7.0 + install smoke test

🤖 Generated with Claude Code