feat(ultraplan-local): v2.2.0 — /ultra-cc-architect-local

New optional command between /ultraresearch-local and /ultraplan-local that
matches brief+research against Claude Code features (hooks, subagents, skills,
output-styles, MCP, plan-mode, worktrees, background-agents) and produces an
architecture note with brief-anchored rationale plus explicit gaps.

Added:
- commands/ultra-cc-architect-local.md (--project, --fg, --quick, --no-gaps)
- agents/architect-orchestrator.md (opus) — 6-phase background orchestrator
- agents/feature-matcher.md (sonnet) — fallback-ranked feature proposals
- agents/gap-identifier.md (sonnet) — 4 gap classes with issue-ready drafts
- agents/architecture-critic.md (sonnet) — hallucination gate as BLOCKER
- skills/cc-architect-catalog/ — SKILL.md + 10 seed entries (reference/pattern)

Changed (non-breaking):
- commands/ultraplan-local.md — auto-discovers architecture/overview.md
- agents/planning-orchestrator.md — cross-references cc_features_proposed
- plugin.json — 2.1.0 → 2.2.0, description, cc-architecture keyword
- CHANGELOG, README, CLAUDE.md (plugin + marketplace root)

Pipeline becomes brief → research → architect → plan → execute. Architect is
optional; existing project dirs keep working unchanged.

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

plugins/ultraplan-local/CHANGELOG.md

@@ -4,6 +4,90 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
+## [2.2.0] - 2026-04-18
+
+### Added — `/ultra-cc-architect-local` optional pipeline step
+
+New optional command that sits between `/ultraresearch-local` and
+`/ultraplan-local`. Reads the task brief plus any research briefs, matches the
+task against available Claude Code features (Hooks, Subagents, Skills, Output
+Styles, MCP, Plan Mode, Worktrees, Background Agents), and produces an
+**architecture note** with brief-anchored rationale and an explicit coverage-
+gap section.
+
+Pipeline position (5-steg):
+
+```
+/ultrabrief-local → /ultraresearch-local → /ultra-cc-architect-local (optional)
+                                         → /ultraplan-local → /ultraexecute-local
+```
+
+The architecture note is designed as *priors* for planning, not mandates —
+`/ultraplan-local` still runs its own exploration and may override proposals
+with evidence.
+
+**New files:**
+
+- `commands/ultra-cc-architect-local.md` — command entry point (7 faser:
+  parse → background → read inputs → feature matching → synthesize → review
+  → present).
+- `agents/architect-orchestrator.md` (opus) — background orchestrator.
+- `agents/feature-matcher.md` (sonnet) — matches CC features against brief +
+  research, with brief-anchored rationale per feature and a documented fallback
+  minimum list when the catalog is empty.
+- `agents/gap-identifier.md` (sonnet) — emits issue-ready gap drafts (no
+  auto-posting; no auto-generation).
+- `agents/architecture-critic.md` (sonnet) — adversarial review with a
+  hallucination gate (features outside catalog + fallback list → blocker).
+- `skills/cc-architect-catalog/SKILL.md` — manifest + frontmatter contract.
+- 10 seed skills in `skills/cc-architect-catalog/`:
+  `hooks-reference`, `hooks-pattern`, `subagents-reference`, `subagents-pattern`,
+  `skills-reference`, `output-styles-reference`, `mcp-reference`,
+  `plan-mode-reference`, `worktrees-reference`, `background-agents-reference`.
+  All handwritten (no third-party content copied, per brief §4.4).
+
+**New flags:**
+
+- `--project <dir>` (required) — reads `{dir}/brief.md` + `{dir}/research/*.md`,
+  writes to `{dir}/architecture/`.
+- `--fg` — foreground execution.
+- `--quick` — skip adversarial review.
+- `--no-gaps` — do not write `gaps.md` (gap-section remains inside
+  `overview.md`).
+
+**New stats file:** `${CLAUDE_PLUGIN_DATA}/ultra-cc-architect-local-stats.jsonl`.
+
+### Changed — `/ultraplan-local` auto-discovers architecture notes
+
+Brief §5 of the `ultra-cc-architect` design said "no changes to existing
+commands". This release makes one permitted, documented exception:
+`/ultraplan-local` now auto-discovers `{project_dir}/architecture/overview.md`
+when running in project mode. The file is additive context — missing file
+produces no error, and behavior when the file is absent is identical to
+v2.1.0. Non-breaking.
+
+**Minimal edits:**
+
+- `commands/ultraplan-local.md` — Phase 1 `--project` branch sets
+  `has_architecture_note` / `architecture_note_path` when the file exists.
+  Phase 3 launch prompt passes `Architecture note: {path or "none"}` to the
+  orchestrator.
+- `agents/planning-orchestrator.md` — Input section documents the new
+  optional field. Phase 4 synthesis cross-references proposed features with
+  exploration findings and carries the note's Coverage gaps into Risks and
+  Mitigations when relevant.
+
+### Non-goals (explicit)
+
+- **Skill-factory is not part of this release.** Cataloging, n-gram
+  computation, auto-generation from CC changelog, concept extraction from
+  reference repos — all deferred to a separate development process. Together
+  with v2.2.0's architect command, that process will eventually land as v3.0.
+- No `/ultra-auto` chaining.
+- No auto-creation of Forgejo/GitHub issues from gap drafts.
+- No changes to `/ultrabrief-local`, `/ultraresearch-local`, or
+  `/ultraexecute-local`.
+
 ## [2.1.0] - 2026-04-18
 
 ### Changed — Dynamic, quality-gated interview in `/ultrabrief-local`