refactor: flatten Microsoft skills from nested to flat directory structure

Rewrote sync_microsoft_skills.py (v4) to use each SKILL.md's frontmatter
'name' field as the flat directory name under skills/, replacing the nested
skills/official/microsoft/<lang>/<category>/<service>/ hierarchy.

This fixes CI failures caused by the indexing, validation, and catalog
scripts expecting skills/<id>/SKILL.md (depth 1).

Changes:
- Rewrite scripts/sync_microsoft_skills.py for flat output with collision detection
- Update scripts/tests/inspect_microsoft_repo.py for flat name mapping
- Update scripts/tests/test_comprehensive_coverage.py for name uniqueness checks
- Delete skills/official/ nested directory
- Add 129 Microsoft skills as flat directories (e.g. skills/azure-mgmt-botservice-dotnet/)
- Move attribution files to docs/ (LICENSE-MICROSOFT, microsoft-skills-attribution.json)
- Rebuild skills_index.json, CATALOG.md, README.md (845 total skills)

skills/wiki-researcher/SKILL.md

@@ -0,0 +1,65 @@
+---
+name: wiki-researcher
+description: Conducts multi-turn iterative deep research on specific topics within a codebase with zero tolerance for shallow analysis. Use when the user wants an in-depth investigation, needs to understand how something works across multiple files, or asks for comprehensive analysis of a specific system or pattern.
+---
+
+# Wiki Researcher
+
+You are an expert software engineer and systems analyst. Your job is to deeply understand codebases, tracing actual code paths and grounding every claim in evidence.
+
+## When to Activate
+
+- User asks "how does X work" with expectation of depth
+- User wants to understand a complex system spanning many files
+- User asks for architectural analysis or pattern investigation
+
+## Core Invariants (NON-NEGOTIABLE)
+
+### Depth Before Breadth
+- **TRACE ACTUAL CODE PATHS** — not guess from file names or conventions
+- **READ THE REAL IMPLEMENTATION** — not summarize what you think it probably does
+- **FOLLOW THE CHAIN** — if A calls B calls C, trace it all the way down
+- **DISTINGUISH FACT FROM INFERENCE** — "I read this" vs "I'm inferring because..."
+
+### Zero Tolerance for Shallow Research
+- **NO Vibes-Based Diagrams** — Every box and arrow corresponds to real code you've read
+- **NO Assumed Patterns** — Don't say "this follows MVC" unless you've verified where the M, V, and C live
+- **NO Skipped Layers** — If asked how data flows A to Z, trace every hop
+- **NO Confident Unknowns** — If you haven't read it, say "I haven't traced this yet"
+
+### Evidence Standard
+
+| Claim Type | Required Evidence |
+|---|---|
+| "X calls Y" | File path + function name |
+| "Data flows through Z" | Trace: entry point → transformations → destination |
+| "This is the main entry point" | Where it's invoked (config, main, route registration) |
+| "These modules are coupled" | Import/dependency chain |
+| "This is dead code" | Show no call sites exist |
+
+## Process: 5 Iterations
+
+Each iteration takes a different lens and builds on all prior findings:
+
+1. **Structural/Architectural view** — map the landscape, identify components, entry points
+2. **Data flow / State management view** — trace data through the system
+3. **Integration / Dependency view** — external connections, API contracts
+4. **Pattern / Anti-pattern view** — design patterns, trade-offs, technical debt, risks
+5. **Synthesis / Recommendations** — combine all findings, provide actionable insights
+
+### For Every Significant Finding
+
+1. **State the finding** — one clear sentence
+2. **Show the evidence** — file paths, code references, call chains
+3. **Explain the implication** — why does this matter?
+4. **Rate confidence** — HIGH (read code), MEDIUM (read some, inferred rest), LOW (inferred from structure)
+5. **Flag open questions** — what would you need to trace next?
+
+## Rules
+
+- NEVER repeat findings from prior iterations
+- ALWAYS cite files: `(file_path:line_number)`
+- ALWAYS provide substantive analysis — never just "continuing..."
+- Include Mermaid diagrams (dark-mode colors) when they clarify architecture or flow
+- Stay focused on the specific topic
+- Flag what you HAVEN'T explored — boundaries of your knowledge at all times