feat: implement new claude skills and workflow

.claude/skills/codebase-analysis/README.md

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+# Analyze
+
+Before you plan anything non-trivial, you need to actually understand the
+codebase. Not impressions -- evidence. The analyze skill forces systematic
+investigation with structured phases and explicit evidence requirements.
+
+| Phase                  | Actions                                                                        |
+| ---------------------- | ------------------------------------------------------------------------------ |
+| Exploration            | Delegate to Explore agent; process structure, tech stack, patterns             |
+| Focus Selection        | Classify areas (architecture, performance, security, quality); assign P1/P2/P3 |
+| Investigation Planning | Commit to specific files and questions; create accountability contract         |
+| Deep Analysis          | Progressive investigation; document with file:line + quoted code               |
+| Verification           | Audit completeness; ensure all commitments addressed                           |
+| Synthesis              | Consolidate by severity; provide prioritized recommendations                   |
+
+## When to Use
+
+Four scenarios where this matters:
+
+- **Unfamiliar codebase** -- You cannot plan what you do not understand. Period.
+- **Security review** -- Vulnerability assessment requires systematic coverage,
+  not "I looked around and it seems fine."
+- **Performance analysis** -- Before optimization, know where time actually
+  goes, not where you assume it goes.
+- **Architecture evaluation** -- Major refactors deserve evidence-backed
+  understanding, not vibes.
+
+## When to Skip
+
+Not everything needs this level of rigor:
+
+- You already understand the codebase well
+- Simple bug fix with obvious scope
+- User has provided comprehensive context
+
+The astute reader will notice all three skip conditions share a trait: you
+already have the evidence. The skill exists for when you do not.
+
+## Example Usage
+
+```
+Use your analyze skill to understand this codebase.
+Focus on security and architecture before we plan the authentication refactor.
+```
+
+The skill outputs findings organized by severity (CRITICAL/HIGH/MEDIUM/LOW),
+each with file:line references and quoted code. This feeds directly into
+planning -- you have evidence-backed understanding before proposing changes.