refactor: write-skill phase 1 refactor — grill, implementation, lessons

Complete 2026-05-18 workstream for write-skill refactor (issue 0018 phase 1).

Grill output (handoff in docs/issues/0018-factory-write-skill.md):
- 6-section standard replaces 8: Role and When/When not dropped (not in
  agentskills.io spec; description carries trigger scope and negatives)
- Frontmatter reduced to 3 fields; provenance moves to META.md
  (progressive disclosure — not loaded at every skill scan)
- SKILL-TEMPLATE.md and META-TEMPLATE.md as authoritative copy-fill artifacts
- CATEGORIES.md as self-contained category reference in skill directory
- Copy and fill explicitly split into separate process steps for determinism

New files in .agents/skills/write-skill/:
- SKILL-TEMPLATE.md — 6-section template with XML blocks and inline examples per section
- META-TEMPLATE.md — provenance schema with inline-commented YAML; source vs references explicit
- CATEGORIES.md — self-contained category table (no runtime dependency on factory docs)
- META.md — write-skill's own provenance (v1.1, self-authored)

SKILL.md rewritten: 8-step process, XML blocks (<requirements>, <steps>, <checks>),
3-field frontmatter, copy-then-fill steps explicit.

Supporting docs updated:
- skill-implementation-workflow.md: SKILL-TEMPLATE.md as authoritative template;
  source:/references: now reference META.md; when: marked resolved
- factory-integration-decisions.md: frontmatter spec corrected
- ROADMAP.md: authoring standard description updated
- CONTEXT.md: Source field entry corrected; META.md added to glossary
- docs/spec/overview.md: 2026-05-18 refactor entry added
- docs/issues/0018: handoff status updated; acceptance criteria marked complete

LESSONS.md: 3 entries added in grill session (cargo-culted body sections,
provenance fields in frontmatter, copy-fill determinism) + 1 from implementation
(planning meta-commentary does not belong in deployed artifacts).

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

docs/ROADMAP.md

@@ -33,7 +33,7 @@ A parallel workstream (not a numbered chunk) that runs alongside the chunk seque
 |---|---|---|
 | ✅ 1 | Repo skeleton + `install.sh` — structure in place, Claude Code wired up | Nothing else can be built without the structure and install working |
 | ✅ 2 | Core instructions — `coding.md`, `git.md` (incl. conventional commits), `testing.md`; communication rules in `providers/claude-code/CLAUDE.md` always-on section; retire `global.md`; migrate `docs/` to subdirectory-by-type naming | Instructions are the foundation everything else references; commit convention and doc naming must be in place before history accumulates |
-| ⏳ 3 | Skills library rebuild — the 12 existing skills are first-draft placeholders that predate the factory research; all are rebuilt or replaced. **Target library:** `docs/research/ai-coding-factory/ai-coding-factory-skills-index.md` is the canonical build reference — use it directly for each skill's trigger description, constraints, and category. Core categories: roles (6), design (3), factory (7 meta-skills — entirely new, high priority), implement (4 incl. tdd multi-file), test (3), review (4), deploy (4), operate (4), cross-cutting (4). Global optional: IaC (7) and Gitea (3) — scope defined in Chunk 3 PRD. **Naming convention:** the skills-index uses `category/skill-name` notation (e.g., `design/grill-me`) for identification only; actual paths are flat per ADR-0009 (`grill-me/SKILL.md`), category expressed in SKILL.md frontmatter. **Authoring standard:** frontmatter (`name`, `description`, `version`, `updated`, `metadata.category`), role, when/when-not, required inputs, constraints, process, output format, failure handling — per `ai-coding-factory-implementation-guidance.md` Section 10. **Process per skill:** check skills-index for trigger description and constraints → check implementation guidance Section 4–5 for framework sourcing → research/inspect open-source implementations → implement. Delete `ai-coding-factory-skills-index.md` when all skills exist. **Infrastructure complete**: 12 skills deployed to `~/.agents/skills/` via `install.sh`; provider adapter pattern in place. | Skills are the most immediately useful output; the rebuild is necessary because existing skills predate the authoring standard and the factory research |
+| ⏳ 3 | Skills library rebuild — the 12 existing skills are first-draft placeholders that predate the factory research; all are rebuilt or replaced. **Target library:** `docs/research/ai-coding-factory/ai-coding-factory-skills-index.md` is the canonical build reference — use it directly for each skill's trigger description, constraints, and category. Core categories: roles (6), design (3), factory (7 meta-skills — entirely new, high priority), implement (4 incl. tdd multi-file), test (3), review (4), deploy (4), operate (4), cross-cutting (4). Global optional: IaC (7) and Gitea (3) — scope defined in Chunk 3 PRD. **Naming convention:** the skills-index uses `category/skill-name` notation (e.g., `design/grill-me`) for identification only; actual paths are flat per ADR-0009 (`grill-me/SKILL.md`), category expressed in SKILL.md frontmatter. **Authoring standard:** see `SKILL-TEMPLATE.md` in `.agents/skills/write-skill/` (authoritative). Frontmatter: `name`, `description`, `metadata.category` only — provenance fields (`version`, `updated`, `when`, `source`, `references`) live in `META.md` per `META-TEMPLATE.md`. Body: 6 sections (Required inputs, Constraints, Process, Output format, Failure handling, Self-check) — Role and When/When not dropped per agentskills.io spec. **Process per skill:** check skills-index for trigger description and constraints → check implementation guidance Section 4–5 for framework sourcing → research/inspect open-source implementations → implement. Delete `ai-coding-factory-skills-index.md` when all skills exist. **Infrastructure complete**: 12 skills deployed to `~/.agents/skills/` via `install.sh`; provider adapter pattern in place. | Skills are the most immediately useful output; the rebuild is necessary because existing skills predate the authoring standard and the factory research |
 | 4 | Workflows — formalize the workstream workflow (kick-off types → grill → artifact → issues → implement → QA → commit); feature, bug, architecture, improvement, feedback patterns. **Prerequisite:** WorkflowContext schema (what each skill in a chain receives and returns) must be designed before any workflow skill is written; `docs/spec/` must exist (implement-feature constraint: update spec in same PR as behavior change) | Higher-level patterns built on top of a working skills foundation; grill feedback intake design before starting |
 | 5 | Agents — role skills (Architect, Developer, Reviewer, Security, QA, Ops) in `.agents/skills/` with `category: roles`; `core/agents/` for provider-agnostic subagent definitions needing isolated execution context (`context: fork`), translated to `.claude/agents/` by adapter; cross-project orchestration agents as use case | Role skills benefit from workflow patterns being established first; subagent definitions require the skills library to be stable |
 | 6 | Sync + project init tooling — `sync.sh` and `init-project.sh` | Tooling only makes sense once there is content worth syncing and scaffolding |