docs: issue 0016 — skill implementation workflow grill

Produces docs/notes/skill-implementation-workflow.md with agreed conventions
for all Chunk 3 skill issues (0017–0028). Key decisions:

- Per-skill process: source discovery (sub-agent) → source review with
  licence/security check (sub-agent) → conflict check vs constitution +
  factory principles (sub-agent) → synthesis grill → co-write iteratively
- Bootstrap: write-eval (hand-written) → write-skill (hand-written) →
  write-docs (first factory-authored, phase 2 of 0018) → everything else
- Upstream review changed from per-chunk-start to per-skill
- `when:` and `references:` frontmatter fields added to authoring standard
- Sub-agent usage prescribed as named steps in the workflow
- HITL: human reviewed and approved conventions

Updates: PRD implementation decisions; issues 0016–0028 with specific
acceptance criteria; docs/spec/overview.md; ROADMAP Chunk 3 housekeeping note
(bootstrap order, cadence, acceptance criteria status); CONTEXT.md Source field
(per-skill cadence, references: companion field); LESSONS.md with three patterns
from the grill session.

Post-grill additions (same session): Step 6 (session handoff) added to the
workflow; handoff section appended to issue 0016; handoff checklist item added
to Chunk 3 closure issue (0028).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/spec/overview.md

@@ -13,7 +13,7 @@ Current skills: `caveman`, `diagnose`, `grill-me`, `grill-with-docs`, `improve-c
 
 **Chunk 3 target:** 42 skills across 9 categories. PRD: `docs/prd/chunk-3-skills-library.md`. Canonical build reference: `docs/research/ai-coding-factory/ai-coding-factory-skills-index.md` (delete once all skills exist). Skills stored flat (`skill-name/SKILL.md`) per ADR-0009; category in `metadata.category` frontmatter. Categories: design, factory, implement, test, review, deploy, operate, cross-cutting, iac (2 skills only — docker-compose + iac-security-review). Role skills (6) deferred to Chunk 5. Gitea skills moved to `providers/gitea/` provider adapter.
 
-**Prerequisite:** AGENTS.md refactor must complete before Chunk 3 skill implementation begins — both `CLAUDE.md` files (repo-level and global) become thin adapters importing `AGENTS.md`. See ADR-0012 (to be written during implementation).
+**Skill implementation workflow:** each skill follows the per-skill process in `docs/notes/skill-implementation-workflow.md` (produced by issue 0016). Sub-agents handle source discovery, source review, and conflict checking; synthesis grill and HITL test are human steps. Bootstrap: write-eval (hand-written) → write-skill (hand-written) → write-docs (first factory-authored) → all others via factory.
 
 ### Claude Code configuration
 - `~/.claude/CLAUDE.md` — thin adapter; imports `~/.agents/AGENTS.md` (Communication + Behavior) and `governance.md`; content index pointers only
@@ -42,6 +42,7 @@ For chunk planning and open questions, see `docs/ROADMAP.md`.
 
 ## Recent changes
 
+- 2026-05-17 — Issue 0016 complete: skill implementation workflow grill completed. `docs/notes/skill-implementation-workflow.md` written. All issues 0017–0028 updated with specific acceptance criteria. Key conventions: sub-agents prescribed at each research/writing step; conflict check against constitution + factory principles before synthesis grill; `when:` and `references:` fields added to authoring standard; write-docs moved to issue 0018 phase 2 (first factory-authored skill).
 - 2026-05-17 — Issue 0015 complete: AGENTS.md refactor implemented. Two AGENTS.md files created (`AGENTS.md` at repo root, `core/AGENTS.md` deployed to `~/.agents/AGENTS.md`). Both CLAUDE.md files slimmed to thin adapters. `deploy-manifest.sh` updated. `docs/spec/architecture.md` updated with new structure. ADR-0012 in effect.
 - 2026-05-17 — Chunk 3 issues created (0015–0028): AGENTS.md refactor prerequisite, skill workflow grill, bootstrap skills (write-eval, write-skill), factory/design/implement/test/review/deploy/operate/IaC/cross-cutting skill groups, chunk closure; all HITL; acceptance criteria for 0017–0028 to be refined after issue 0016 grill session
 - 2026-05-17 — behavioral tests fully resolved: `CONTEXT.md` now always-loaded via `@import` in repo `CLAUDE.md`; standing rule added to check `docs/adr/` and ROADMAP resolved entries before answering design questions; communication/behavior and secrets rules tightened; Chunk 2 and Governance Phase 1 ✅ complete