docs(spf): describe pr skill

.claude/skills/README.md

@@ -18,6 +18,7 @@ Specialized knowledge for AI agents working on Video.js 10.
 | Reviewing accessibility    | `aria` → `review/workflow.md`      |
 | Accessibility audit        | `aria`                             |
 | Committing / creating PRs  | `git` or `/commit-pr`              |
+| Reviewer-oriented PR descriptions (SPF) | `/spf-describe-pr`        |
 | CSS → Tailwind migration   | `css-to-tailwind`                  |
 | Reviewing Tailwind migration | `css-to-tailwind` → `review/workflow.md` |
 | Reviewing branch changes   | `/review-branch`                   |
@@ -43,17 +44,18 @@ Specialized knowledge for AI agents working on Video.js 10.
 | [docs](docs/SKILL.md)                   | Write Video.js 10 documentation (concepts, how-to, READMEs)    | Yes         |
 | [gh-issue](gh-issue/SKILL.md)           | Analyze GitHub issues and create implementation plans                  | No          |
 | [git](git/SKILL.md)                     | Git workflow — commit messages, PRs, branch naming, scope inference    | No          |
-| [merge-behaviors](merge-behaviors/SKILL.md) | Merge two SPF behaviors with cleaned-shape-first discipline        | No          |
-| [refactor-behavior](refactor-behavior/SKILL.md) | Refactor an SPF behavior using purpose-first discipline       | No          |
 | [review-branch](review-branch/SKILL.md) | Review branch changes and suggest improvements                         | No          |
 | [rfc](rfc/SKILL.md)                     | Write RFCs — proposals needing buy-in (public API, product, DX)        | No          |
 | [spf-create-behavior](spf-create-behavior/SKILL.md) | Create a new SPF behavior with conventions-aligned shape (stub; grows with use) | No |
+| [spf-describe-pr](spf-describe-pr/SKILL.md) | Draft/revise reviewer-oriented PR descriptions for SPF-area PRs (bucket-calibrated reading order, five-label set, smoke-test discipline) | No |
 | [spf-document-feature](spf-document-feature/SKILL.md) | Produce/update SPF feature registry docs (triangulation, cluster heuristics, cross-cutting checks, cascade) | No |
 | [spf-document-use-case](spf-document-use-case/SKILL.md) | Produce/update SPF use-case-composition registry docs (four-mechanism taxonomy, constituent-feature cascade) | No |
 | [spf-implement-feature](spf-implement-feature/SKILL.md) | Implement an SPF feature from its registry doc (disambiguation, phase scoping, chunk decomposition, downstream-skill routing, doc-as-starting-point) | No |
 | [spf-implement-use-case](spf-implement-use-case/SKILL.md) | Implement an SPF use-case composition from its registry doc (disambiguation/routing, constituent-feature readiness, variant assembly, doc-as-starting-point) | No |
-| [spf-update-behavior](spf-update-behavior/SKILL.md) | Update an existing SPF behavior whose purpose is changing (stub; distinct from /refactor-behavior which preserves purpose) | No |
-| [split-behavior](split-behavior/SKILL.md) | Split one SPF behavior into N with axis-declared, constraints-audited discipline | No |
+| [spf-merge-behaviors](spf-merge-behaviors/SKILL.md) | Merge two SPF behaviors with cleaned-shape-first discipline        | No          |
+| [spf-refactor-behavior](spf-refactor-behavior/SKILL.md) | Refactor an SPF behavior using purpose-first discipline       | No          |
+| [spf-split-behavior](spf-split-behavior/SKILL.md) | Split one SPF behavior into N with axis-declared, constraints-audited discipline | No |
+| [spf-update-behavior](spf-update-behavior/SKILL.md) | Update an existing SPF behavior whose purpose is changing (stub; distinct from /spf-refactor-behavior which preserves purpose) | No |
 
 ## Review Workflows
 

.claude/skills/spf-create-behavior/SKILL.md

@@ -2,10 +2,10 @@
 name: spf-create-behavior
 description: >-
   Create a new SPF behavior with conventions-aligned shape. Walks through
-  purpose articulation (carries /refactor-behavior's purpose-first discipline),
+  purpose articulation (carries /spf-refactor-behavior's purpose-first discipline),
   signal type choice, slot map design, composition placement, cleanup pattern
   selection, test placement, and engine wiring. Distinct from
-  /refactor-behavior (which modifies an existing behavior preserving its
+  /spf-refactor-behavior (which modifies an existing behavior preserving its
   purpose) and /spf-update-behavior (which modifies an existing behavior whose
   purpose is changing). Triggers: "create behavior", "new behavior", "create
   SPF behavior", "add behavior", "scaffold behavior", "new SPF behavior".
@@ -58,7 +58,7 @@ Required reading before drafting:
 
 ## Failure-mode catalog (seeded; grows with use)
 
-- **Purpose-articulation skipped.** Same failure mode as `/refactor-behavior`:
+- **Purpose-articulation skipped.** Same failure mode as `/spf-refactor-behavior`:
   jumping from "we need a behavior" to `defineBehavior` without naming what
   the behavior *does* in business terms. Carries the purpose-first
   discipline. The articulation should answer: what business rule does this
@@ -94,7 +94,7 @@ Required reading before drafting:
 
 ### Step 1 — Articulate purpose
 
-Carry `/refactor-behavior`'s purpose-first discipline forward to new
+Carry `/spf-refactor-behavior`'s purpose-first discipline forward to new
 behaviors. Before any code:
 
 - **What business rule does this behavior implement?** Name it in plain
@@ -170,10 +170,10 @@ Audit checklist:
 
 ## When this is the wrong skill
 
-- **Refactoring an existing behavior, purpose preserved** → `/refactor-behavior`
+- **Refactoring an existing behavior, purpose preserved** → `/spf-refactor-behavior`
 - **Updating an existing behavior, purpose changing** → `/spf-update-behavior`
-- **Splitting / merging existing behaviors** → `/split-behavior` /
-  `/merge-behaviors` (often routed through `/refactor-behavior`)
+- **Splitting / merging existing behaviors** → `/spf-split-behavior` /
+  `/spf-merge-behaviors` (often routed through `/spf-refactor-behavior`)
 - **Creating a media-layer or network-layer helper (not a behavior)** →
   manual for now; future media-layer / network-layer skills will own this