feat: 100 skills milestone — 7 new skills + quality improvements across all 93

New skills added:
- teaching-lesson-plan: structured lesson plans for any subject/audience/setting
- seo-content-brief: complete SEO briefs with intent, competitor gaps, and outline
- media-pitch: story-first journalist pitches with angle development framework
- change-management-plan: stakeholder analysis, comms strategy, adoption metrics
- workshop-facilitation-guide: activity instructions, decision protocols, facilitator moves
- sales-forecasting-model: pipeline model, scenario analysis, assumption log
- tax-planning-checklist: year-end tax planning across income, pension, CGT, reliefs

Quality improvements across all 93 existing skills:
- Standardised description format: "Verb the thing. Use when X. Produces Y."
- Added Required Inputs section to all skills missing it (prompts for missing info)
- Added Quality Checks section to all skills missing it (specific, not generic)
- Fixed broken multiline YAML descriptions
- Removed non-standard frontmatter keys (tool_integration, metadata blocks)

README updated to v6.0.0 with 100-skill count, new skill tables, and article series

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

skills/rice-impact-matrix/SKILL.md

@@ -1,13 +1,21 @@
 ---
 name: rice-impact-matrix
-description: Score features using RICE and plot against strategic alignment for nuanced prioritisation
-tool_integration: Miro, Jira
+description: "Score features using RICE and plot against strategic alignment for nuanced prioritisation. Use when asked to prioritise features, build a priority matrix, combine quantitative scoring with strategic fit, or decide what to build next with multiple competing initiatives. Produces a scored priority matrix with RICE scores, strategic alignment ratings, quadrant placement, and sequencing recommendations."
 ---
+
 # RICE + Strategic Alignment Skill
 
-## Purpose
 Produce a prioritisation output that balances quantitative RICE scoring with qualitative strategic fit — because the highest RICE score isn't always the right next bet.
 
+## Required Inputs
+
+Ask the user for these if not provided:
+- **List of initiatives or features to prioritise** (names and brief descriptions)
+- **Current strategic priorities or OKRs** (needed to rate strategic alignment)
+- **Reach estimates** (users affected per quarter — even rough estimates work)
+- **Effort estimates** (person-months — from engineering if available)
+- **Quarter or planning period**
+
 ## Two-Stage Process
 
 ### Stage 1: RICE Scoring
@@ -18,7 +26,7 @@ Produce a prioritisation output that balances quantitative RICE scoring with qua
 - RICE = (R × I × C) / E
 
 ### Stage 2: Strategic Alignment Score
-Rate each initiative against your current strategic priorities (provide these as input):
+Rate each initiative against your current strategic priorities (provided as input):
 - Directly supports top OKR: +3
 - Supports secondary OKR: +2
 - Neutral: +1
@@ -27,7 +35,9 @@ Rate each initiative against your current strategic priorities (provide these as
 ### Final Priority Score
 Combined Score = RICE Score + (Strategic Alignment × 10)
 
-## Output Format
+**Validate** — Flag any initiative where RICE score and strategic alignment conflict sharply (e.g., high RICE, low alignment). These require an explicit team conversation before sequencing.
+
+## Output Structure
 
 ### Priority Matrix — [Quarter]
 | Initiative | RICE Score | Strategic Alignment | Combined Score | Quadrant | Recommendation |
@@ -42,3 +52,11 @@ Combined Score = RICE Score + (Strategic Alignment × 10)
 
 #### Recommendations
 [Top 5 initiatives with rationale for sequencing]
+
+## Quality Checks
+
+- [ ] All RICE components have an estimate (even if low confidence — flag those)
+- [ ] Strategic alignment is rated against specific OKRs, not general "feels strategic"
+- [ ] Conflicts between RICE rank and strategic alignment are explicitly flagged
+- [ ] "Drop" recommendations are specific — not just "low priority, deprioritise"
+- [ ] Confidence levels on estimates are noted where weak (drives the 50% confidence flag)