refactor(linkedin-studio): S29e terminology-scrub — rename thought-leadership-angles.md -> content-angles.md + all pointers

Final sub-pass of the S29 plugin-wide terminology scrub. The canonical reference file is
renamed and every functional pointer updated atomically in one commit. The file's in-file
title/headers were already FORM A-scrubbed in S29c (H1 reads "Content Angles"), so S29e is a
pure rename + pointer update — no FORM A remained in the file.

Rename: references/thought-leadership-angles.md -> references/content-angles.md (git mv).

Pointers updated (17 files, 29 occurrences) — token "thought-leadership-angles" -> "content-angles":
- references/ (2): ai-content-framework, glossary
- agents/ (7): content-repurposer, strategy-advisor, network-builder, content-planner,
  trend-spotter, video-scripter, differentiation-checker
- commands/ (6): pipeline, video, post, competitive, react, batch
- skills/ (1): linkedin-content-creation/SKILL
- docs/ (1, forward-looking): integration-test-guide

Left URØRT per the standing S29 decision (history = honest record of a past state, not a
runtime load): CHANGELOG.md, docs/hardening/log.md, docs/hardening/plan.md. STATE.md untouched
here (rewritten at session end).

Verify: no thought-leadership-angles* file remains; references/content-angles.md present; zero
residual "thought-leadership-angles" in commands/agents/references/skills/integration-test-guide;
structure gate scripts/test-runner.sh 81/0/0 exit 0.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016qgzo6rxthw7KuxHjn5vyE

references/ai-content-framework.md

@@ -379,7 +379,7 @@ Before posting AI content:
 
 This framework integrates with the main LinkedIn content skill:
 
-- **Angles:** AI content uses same 8 angles (thought-leadership-angles.md)
+- **Angles:** AI content uses same 8 angles (content-angles.md)
 - **Formats:** Follow format guidelines in linkedin-formats.md
 - **Engagement:** Apply same engagement frameworks
 - **Growth:** Contributes to overall authority building

references/glossary.md

@@ -28,7 +28,7 @@ Signal triggers that correlate with lower reach: excessive hashtags, external li
 ### Angle Rotation
 Systematic application of 8 universal content angles across the same topic to create distinct post variations without repeating yourself. The 8 angles: Contrarian Take, Pattern Recognition, Uncomfortable Truth, Future Implication, Personal Lesson, Reframe, Practical Breakdown, Human Story.
 
-**Used in:** `references/thought-leadership-angles.md`, `agents/content-planner.md`, `agents/trend-spotter.md`
+**Used in:** `references/content-angles.md`, `agents/content-planner.md`, `agents/trend-spotter.md`
 
 ### Authority Score
 Composite metric measuring a creator's established expertise on a topic, derived from posting consistency, engagement quality, profile alignment (topic-relevance), and network validation. Higher authority unlocks broader distribution.
@@ -229,7 +229,7 @@ Penalty state where posts reach only immediate connections without algorithmic a
 ### Authority Value Test
 Three-question quality gate before publishing: (1) Does this help someone make a better decision? (2) Does this change how someone thinks? (3) Would I find this valuable if someone else wrote it? Must pass all three.
 
-**Used in:** `references/thought-leadership-angles.md`, `agents/differentiation-checker.md`, `agents/trend-spotter.md`
+**Used in:** `references/content-angles.md`, `agents/differentiation-checker.md`, `agents/trend-spotter.md`
 
 ### Topical Consistency
 Posting about consistent topics within demonstrated expertise areas. The algorithm learns your domain expertise over 30+ days. Gaps >5 days trigger -15-25% reach penalty on return.