feat(ultraplan-local): Spor 2 — HANDOVER-CONTRACTS.md + PreCompact-hook (P0 progress.json drift fix)

Reconciles divergence after parallel-session race: includes both Spor 1 wiring (validators inn i 4 commands + 1 agent) og Spor 2 (HANDOVER-CONTRACTS.md + PreCompact-hook).

Spor 1 wiring (re-applied etter rebase):
- /ultrabrief-local Phase 4g — brief-validator post-write
- /ultraplan-local Phase 1 — brief-validator --soft + research-validator --dir + architecture-discovery
- planning-orchestrator Phase 5.5 — plan-validator --strict erstatter 3 grep -cE-kall
- /ultraexecute-local Phase 2.3 (--validate) — plan-validator + progress-validator
- YAML-parser-utvidelse: list-of-dicts (must_contain), støtter v1.7 template-format

Spor 2 NEW:
- docs/HANDOVER-CONTRACTS.md (~310 linjer) — single source of truth for de 5 pipeline-handover-formatene m/ faste sub-headinger (Producer / Consumer / Path / Frontmatter schema / Body invariants / Validation strategy / Versioning / Failure modes)
- hooks/scripts/pre-compact-flush.mjs (NY) — fikser dokumentert P0 i docs/ultraexecute-v2-observations-from-config-audit-v4.md:
  * Fyrer på PreCompact-event (CC v2.1.105+)
  * Lokaliserer progress.json under .claude/projects/*/
  * Sammenligner stored current_step mot git log {session_start_sha}..HEAD
  * Atomisk write (tmp + rename), monoton — current_step kan aldri reduseres
  * Aldri blokkerer compaction (exit 0)
- hooks/hooks.json registrerer PreCompact-hooken

Resultat: /ultraexecute-local --resume virker nå etter context compaction selv ved skill-driven execution.

Docs:
- README.md (plugin): "Quality infrastructure", "Handover contracts", "PreCompact resume integrity"
- CLAUDE.md (plugin): peker til HANDOVER-CONTRACTS.md + dokumenterer pre-compact-flush
- README.md (marketplace root): bullet-liste over Spor 2-deliverables (resolved merge-konflikt fra parallell-sesjon)

Tester: 109 grønn (ingen regresjon).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

plugins/ultraplan-local/CLAUDE.md

@@ -109,6 +109,10 @@ Tests under `tests/**/*.test.mjs` (109 tests, 0 deps). `npm test` is the fork-re
 
 Doc-consistency test at `tests/lib/doc-consistency.test.mjs` pins agent-table count, command-table coverage, plan_version invariant, and settings.json scope cleanliness.
 
+`docs/HANDOVER-CONTRACTS.md` is the single source of truth for the 5 pipeline handovers (brief→research, research→plan, architecture→plan EXTERNAL, plan→execute, progress.json resume). Read it before changing any artifact format.
+
+`hooks/scripts/pre-compact-flush.mjs` (PreCompact event, CC v2.1.105+) fixes the documented P0 in `docs/ultraexecute-v2-observations-from-config-audit-v4.md`: keeps `progress.json` in sync with git history before context compaction so `--resume` works after long conversations. Atomic write, monotonic only, never blocks compaction.
+
 ## Architecture
 
 **Brief:** 7-phase workflow: Parse mode → Create project dir → Phase 3 completeness loop (section-driven, no question cap) → Phase 4 draft/review/revise with `brief-reviewer` as stop-gate (max 3 iterations; gate = all dimensions ≥ 4 and research plan = 5) → Finalize (`brief.md` on pass, or `brief_quality: partial` on cap/force-stop) → Manual/auto opt-in → Stats. Always interactive. Auto mode runs research + plan inline in the main context (v2.4.0).