docs: strip dead docs/superpowers/ refs across ADRs + guides + glossary

The docs/superpowers/{specs,plans}/ directory was archived to .archive/
in an earlier session (and .archive/ is gitignored). Every md link
into that path is now a broken reference for anyone consuming the
template fresh.

Stripped:
  - ADR-011: **Spec:** header line
  - ADR-015: **Spec:** + **Plan:** header lines
  - ADR-016: **Spec:** + **Plan:** header lines + footer "Spec —"
    bullet (the design rationale is captured in the ADR body itself)
  - ADR-017: **Spec:** + **Plan:** header lines
  - ADR-018: **Spec:** + **Plan:** header lines
  - guides/realtime.md: inline "the full spec" link + footer
    [Spec] entry (folded its description into the ADR-016 entry)
  - guides/events-and-jobs.md: inline "the full spec" link
  - architecture/vertical-feature-spec.md: stale "Deleted" subsection
    referencing docs/superpowers/plans/*

Updated:
  - glossary.md "PRD" entry: clarified status flow now matches the
    shipped pnpm work prd-ship lifecycle (draft -> in-review ->
    approved -> shipped); removed the parenthetical pointing at
    docs/superpowers/specs/ as a definition of "spec"
  - glossary.md "spec" flagged-ambiguity: rewritten to reflect that
    durable design lives in ADRs (docs/decisions/adr-NNN-*.md) and
    implementation seeds live in PRDs (docs/work/prds/*.prd.md) —
    "spec" should be avoided in this template

Preserved (legitimate refs to the SuperPowers plugin, not the dir):
  - agent-first-workflow-and-conformance.md mentions of
    `superpowers:brainstorming` — these reference the external
    plugin skill, not a file in the repo

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/glossary.md

@@ -204,8 +204,8 @@ The `bindAll()` decision that selects OTel+Sentry instrumentation when a DSN env
 ## Workflow
 
 **PRD**:
-The top-level requirements doc at `docs/work/prds/<date>-<slug>.prd.md`. Status flows `draft → in-review → approved → superseded`. `pnpm work decompose` refuses to run on `draft`.
-_Avoid:_ spec (use "spec" only for `docs/superpowers/specs/` design docs).
+The top-level requirements doc at `docs/work/prds/<date>-<slug>.prd.md`. Status flows `draft → in-review → approved → shipped` (`pnpm work prd-ship` auto-flips on epic completion). `pnpm work decompose` refuses to run on `draft`.
+_Avoid:_ spec (in this template the **ADR** is the durable design record; PRDs are the implementation seed).
 
 **Epic**:
 A large body of work, one folder under `docs/work/<epic-slug>/` with `_epic.md`. Decomposed from a PRD.
@@ -264,7 +264,7 @@ The shipping rhythm. One vertical slice closes one task, becomes one PR, lands a
 - **"schema"** — qualify: **Zod schema** (input/output contracts) | **Payload collection schema** (CMS field definitions).
 - **"config"** — qualify: **Payload config** | **Next config** | **Vitest config** | **TS config**.
 - **"bind"** — DI binding (`bind<I>(SYMBOL).toDynamicValue(...)`); not a `Function.prototype.bind`.
-- **"spec"** — `docs/superpowers/specs/` design doc; never a PRD or a Jest spec file.
+- **"spec"** — avoid in this template. Durable design records are **ADRs** (`docs/decisions/adr-NNN-*.md`); implementation seeds are **PRDs** (`docs/work/prds/*.prd.md`). Never use "spec" to refer to a Jest spec file either.
 - **"controller"** — one verb-noun pair per file; never a multi-method MVC controller.
 - **"module"** — avoid for packages (use "package"); reserve for Node ESM/CJS module semantics if needed.
 - **"coverage"** — qualify when ambiguous: **L0 coverage** (per-layer thresholds, test-time) | **diff coverage / L1** (cover-the-diff gate) | **aggregate coverage / L2** (committed summary.json) | **mutation coverage / L3** (Stryker mutation score, not line coverage).