feat(marketplace): add domain metadata to all plugins [BREAKING]

- domain field required in plugin.json and marketplace.json (core/data/ops)
- validate-marketplace.sh enforces domain presence and allowed values
- claude-launch.sh new profiles: saas, ops, debug; infra deprecated
- CANONICAL-PATHS.md and CLAUDE.md updated with domain conventions

BREAKING CHANGE: validate-marketplace.sh rejects plugins without domain field

Version: 8.0.0

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

CLAUDE.md

@@ -391,13 +391,32 @@ Stored in Gitea Wiki under `lessons-learned/sprints/`.
 
 ### Adding a New Plugin
 
-1. Create `plugins/{name}/.claude-plugin/plugin.json`
-2. Add entry to `.claude-plugin/marketplace.json` with category, tags, license
+1. Create `plugins/{name}/.claude-plugin/plugin.json` — must include `"domain"` field (`core`, `data`, `saas`, `ops`, or `debug`)
+2. Add entry to `.claude-plugin/marketplace.json` with category, tags, license, and `"domain"` field (must match plugin.json)
 3. Create `claude-md-integration.md`
 4. If using new MCP server, add to root `mcp-servers/` and update `.mcp.json`
-5. Run `./scripts/validate-marketplace.sh`
+5. Run `./scripts/validate-marketplace.sh` — rejects plugins without valid `domain` field
 6. Update `CHANGELOG.md`
 
+**Domain field is required (v8.0.0+):**
+```json
+{
+  "name": "plugin-name",
+  "domain": "core",
+  ...
+}
+```
+
+**Naming convention:** New plugins use domain prefix (`saas-*`, `ops-*`, `data-*`, `debug-*`). Core plugins have no prefix.
+
+### Domain Assignments
+
+| Domain | Plugins |
+|--------|---------|
+| `core` | projman, git-flow, pr-review, code-sentinel, doc-guardian, clarity-assist, contract-validator, claude-config-maintainer, project-hygiene |
+| `data` | data-platform, viz-platform |
+| `ops` | cmdb-assistant |
+
 ### Adding a Command to projman
 
 1. Create `plugins/projman/commands/{name}.md`