feat: implement new claude skills and workflow

.claude/skills/planner/CLAUDE.md

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+# skills/planner/
+
+## Overview
+
+Planning skill with resources that must stay synced with agent prompts.
+
+## Index
+
+| File/Directory                        | Contents                                       | Read When                                    |
+| ------------------------------------- | ---------------------------------------------- | -------------------------------------------- |
+| `SKILL.md`                            | Planning workflow, phases                      | Using the planner skill                      |
+| `scripts/planner.py`                  | Step-by-step planning orchestration            | Debugging planner behavior                   |
+| `resources/plan-format.md`            | Plan template (injected by script)             | Editing plan structure                       |
+| `resources/temporal-contamination.md` | Detection heuristic for contaminated comments  | Updating TW/QR temporal contamination logic  |
+| `resources/diff-format.md`            | Unified diff spec for code changes             | Updating Developer diff consumption logic    |
+| `resources/default-conventions.md`    | Default structural conventions (4-tier system) | Updating QR RULE 2 or planner decision audit |
+
+## Resource Sync Requirements
+
+Resources are **authoritative sources**.
+
+- **SKILL.md** references resources directly (main Claude can read files)
+- **Agent prompts** embed resources 1:1 (sub-agents cannot access files
+  reliably)
+
+### plan-format.md
+
+Plan template injected by `scripts/planner.py` at planning phase completion.
+
+**No agent sync required** - the script reads and outputs the format directly,
+so editing this file takes effect immediately without updating any agent
+prompts.
+
+### temporal-contamination.md
+
+Authoritative source for temporal contamination detection. Full content embedded
+1:1.
+
+| Synced To                    | Embedded Section           |
+| ---------------------------- | -------------------------- |
+| `agents/technical-writer.md` | `<temporal_contamination>` |
+| `agents/quality-reviewer.md` | `<temporal_contamination>` |
+
+**When updating**: Modify `resources/temporal-contamination.md` first, then copy
+content into both `<temporal_contamination>` sections.
+
+### diff-format.md
+
+Authoritative source for unified diff format. Full content embedded 1:1.
+
+| Synced To             | Embedded Section |
+| --------------------- | ---------------- |
+| `agents/developer.md` | `<diff_format>`  |
+
+**When updating**: Modify `resources/diff-format.md` first, then copy content
+into `<diff_format>` section.
+
+### default-conventions.md
+
+Authoritative source for default structural conventions (four-tier decision
+backing system). Embedded 1:1 in QR for RULE 2 enforcement; referenced by
+planner.py for decision audit.
+
+| Synced To                    | Embedded Section        |
+| ---------------------------- | ----------------------- |
+| `agents/quality-reviewer.md` | `<default_conventions>` |
+
+**When updating**: Modify `resources/default-conventions.md` first, then copy
+full content verbatim into `<default_conventions>` section in QR.
+
+## Sync Verification
+
+After modifying a resource, verify sync:
+
+```bash
+# Check temporal-contamination.md references
+grep -l "temporal.contamination\|four detection questions\|change-relative\|baseline reference" agents/*.md
+
+# Check diff-format.md references
+grep -l "context lines\|AUTHORITATIVE\|APPROXIMATE\|context anchor" agents/*.md
+
+# Check default-conventions.md references
+grep -l "default_conventions\|domain: god-object\|domain: test-organization" agents/*.md
+```
+
+If grep finds files not listed in sync tables above, update this document.