Add archify skill (v2.14), pi-mermaid ext (v0.3.0), project-diagramming-mermaid + project-diagramming-archify skills

- skills/archify: vendored tt-a1i/archify 2.14.0 (MIT), pure Node 18+, zero deps
- extensions/pi-mermaid: renders mermaid blocks as ASCII in TUI; deps beautiful-mermaid + mermaid
- skills/project-diagramming-*: orchestration skills, per-project docs/ convention

skills/project-diagramming-archify/SKILL.md

@@ -0,0 +1,71 @@
+---
+name: project-diagramming-archify
+description: Create or update an interactive Archify architecture map for a project. Accept plain-language requirements or pasted Mermaid (flowchart/sequence/stateDiagram) and compile typed JSON IR into a self-contained interactive HTML diagram (architecture, workflow, sequence, dataflow, lifecycle) under the project's docs/ directory. Use when the user asks for architecture/flow/data visualization, or the diagrams were just created/updated with project-diagramming-mermaid. Per-project only — never global.
+version: 1.0.0
+---
+
+# project-diagramming-archify
+
+Create polished, validated, interactive architecture diagrams as standalone HTML (with inline SVG, dark/light themes, pan/zoom, search, route tracing, PNG/SVG/WebM export) from typed JSON IR, using the bundled `archify.mjs` renderer. Everything lands under the project's `docs/` directory.
+
+## When to use
+
+- User asks for a client-facing / interactive architecture or flow visualization.
+- The mermaid flow just completed (project-diagramming-mermaid) and the user said yes to the follow-up prompt.
+- User asks to update an existing Archify map.
+
+## The skill asset
+
+The renderer/vendor skill lives at `~/.agents/skills/archify/` (Archify v2.14, MIT, from tt-a1i/archify). It is self-contained: pure Node ≥18, zero npm deps. Key entry point:
+
+```bash
+node ~/.agents/skills/archify/bin/archify.mjs <command> ...
+```
+
+Commands (from the vendored skill's fast authoring path):
+- `guide "<scenario>" --json` — when unsure which diagram type fits the ask.
+- `validate <type> <candidate.json> --quality showcase --json` — iterate during authoring; **showcase pass = 9 artifact checks, 0 composition errors, 0 warnings**.
+- `deliver <type> <candidate.json> <output.html> --quality showcase --json` — final acceptance (freezes spec bytes, atomically commits HTML, reports SHA-256 + byte counts).
+- `visual-check <output.html> --json` — best-effort screenshot/containment evidence; needs Chrome/Chromium, exit 2 = skipped gracefully (e.g. .13 has no chrome). Never claim visual inspection you did not perform.
+
+## Canonical workflow (per project)
+
+1. **Scope + type** — map the ask to a type: architecture (components/services/boundaries), workflow (processes/gates), sequence (API/request chains), dataflow (pipelines/ETL/lineage), lifecycle (state transitions). If ambiguous: `node ~/.agents/skills/archify/bin/archify.mjs guide "<scenario>" --json`.
+2. **Author JSON IR** — read one matching schema (`schemas/<type>.schema.json` + `schemas/common.schema.json`) and one matching example (`examples/<type>.*.json`) from the vendored skill. Author **fresh** JSON: new stable IDs, domain wording, layout. ≤ 12 primary nodes; one obvious main path; sparse labels. Set `meta.quality_profile` to `"showcase"` unless the user explicitly asks for a dense `standard` map.
+3. **Accept Mermaid input** (common path — after project-diagramming-mermaid): read the Mermaid for topology & meaning, then author fresh Archify JSON (do not mechanically copy styling):
+   - `flowchart` / `graph` → `workflow`, or `architecture` for a component map.
+   - `sequenceDiagram` → `sequence` (participants → semantic participants, arrows → messages).
+   - `stateDiagram` → `lifecycle` (states & transitions keep meaning).
+4. **Validate-iterate**: `validate` after every candidate edit and immediately before handoff. Fix only diagnosed issues; if two consecutive rounds don't improve the error count, stop and report truthfully.
+5. **Deliver**: `deliver <type> <candidate.json> <output.html> --quality showcase --json`. Non-zero exit is never success.
+
+## Output locations (per-project, always under the project's docs/)
+
+- **JSON IR source (single source of truth):** `<project>/docs/archify/<topic>.<type>.json`
+- **Interactive HTML map:** `<project>/docs/<topic>-map.html`
+- Schemas/examples to consult: `~/.agents/skills/archify/schemas/`, `~/.agents/skills/archify/examples/`.
+
+Create `<project>/docs/` (+ `docs/archify/`) if missing. Never write artifacts outside the project directory.
+
+## Authoring rules (subset of the vendored skill — read SKILL.md for full invariants)
+
+- Omit `meta.visual_preset`, `meta.subtitle`, `meta.legend`, `meta.engineering_profile` by default.
+- Match authored strings to the user's language; preserve exact product names / commands / API paths / env names.
+- Automatic routes own their endpoint sides; never accept an edge crossing an unrelated opaque node.
+- Sequence: omit `meta.column_fit` (fixed); use `"spread"` when participants don't fit.
+- Component types: `frontend`, `backend`, `database`, `cloud`, `security`, `messagebus`, `external`. Variants: `default`, `emphasis`, `security`, `dashed`.
+
+## Per-project activation
+
+Activated **per project** with `/config-add skill project-diagramming-archify` (and the vendor skill `archify` is the renderer asset). If not available in the current project, that's expected — assets activate per project to keep context lean.
+
+## Related
+
+- `project-diagramming-mermaid` — Mermaid flow that feeds into this skill (and the user-facing prompt to come here).
+- `pi-mermaid` extension — ASCII preview of Mermaid in-chat.
+- `nixos-workflow` skill — asset management (Gitea pi-config).
+- `system-architect` skill — infra reference.
+
+## Obsidian documentation
+
+Tools documented at `300 areas/360 Dev-Ops Network Computers/Dev-Ops Tooling — Mermaid, Archify, Vikunja & Outline.md` (+ the network & container docs link it). Do not recreate diagram versions of those docs.