docs(11.1): create phase plan

Six plans (tracer generator, site UX and checkers, content A, content B,
acme/blog walkthrough, unit tests). SC4/DOCS-04 narrowed to docs/ pages per
D-18; README Go fence conversion logged as a todo.

.planning/REQUIREMENTS.md

@@ -128,7 +128,7 @@ Requirements for v1 (the Płytarium port). Each maps to roadmap phases. "User" b
 - [ ] **DOCS-01**: `docs/` holds Markdown pages with strict YAML frontmatter (title, description, section, order), grouped into the Winter-mirroring sections, and every framework module under `modules/` is reachable from the sidebar through an API reference page ingested from its README
 - [ ] **DOCS-02**: `summer docs:build` writes a self-contained static site (sidebar, on-page TOC, prev/next, edit-this-page link, client-side search, light/dark/system theme) and `summer docs:serve` previews it on loopback; no Node toolchain, and the only new dependency is `alecthomas/chroma/v2` for syntax highlighting (approved at the 11.1 plan-count checkpoint)
 - [ ] **DOCS-03**: The build emits `llms.txt`, `llms-full.txt` and a clean `.md` beside every `.html` page, and a test asserts all three match the page tree
-- [ ] **DOCS-04**: Every Go fence in the docs references compiled source by `src=`; a test fails on a missing or drifted snippet, and referenced Examples carry `// Output:` and run under `go test ./...`
+- [ ] **DOCS-04**: Every Go fence in a `docs/` page references compiled source by `src=` (Go fences in ingested module READMEs are identifier-checked only, per D-18); a test fails on a missing or drifted snippet, and referenced Examples carry `// Output:` and run under `go test ./...`
 - [ ] **DOCS-05**: `go test ./...` runs checkers that fail on stale identifiers (docs pages and module READMEs), broken internal links and anchors, unknown `summer`/runtime CLI command names and forbidden consuming-application names
 - [ ] **DOCS-06**: A "Coming from WinterCMS" page maps Winter concepts to SummerCMS equivalents, and every SummerCMS identifier on it is checker-verified
 - [ ] **DOCS-07**: An `acme/blog` porting walkthrough covers models, migrations, routes, an admin controller and a console command; its code is a real in-root package under `docs/examples/blog`, verified by DOCS-04