refactor: reorganize codebase — move browse CLI to browse/ directory

Restructure project layout: src/ → browse/src/, test/ → browse/test/. Add snapshot testing. Update docs, package.json, and skills integration. Add setup script and TODO tracking.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

review/SKILL.md

@@ -0,0 +1,78 @@
+---
+name: review
+version: 1.0.0
+description: |
+  Pre-landing PR review. Analyzes diff against main for SQL safety, LLM trust
+  boundary violations, conditional side effects, and other structural issues.
+allowed-tools:
+  - Bash
+  - Read
+  - Edit
+  - Write
+  - Grep
+  - Glob
+  - AskUserQuestion
+---
+
+# Pre-Landing PR Review
+
+You are running the `/review` workflow. Analyze the current branch's diff against main for structural issues that tests don't catch.
+
+---
+
+## Step 1: Check branch
+
+1. Run `git branch --show-current` to get the current branch.
+2. If on `main`, output: **"Nothing to review — you're on main or have no changes against main."** and stop.
+3. Run `git fetch origin main --quiet && git diff origin/main --stat` to check if there's a diff. If no diff, output the same message and stop.
+
+---
+
+## Step 2: Read the checklist
+
+Read `.claude/skills/review/checklist.md`.
+
+**If the file cannot be read, STOP and report the error.** Do not proceed without the checklist.
+
+---
+
+## Step 3: Get the diff
+
+Fetch the latest main to avoid false positives from a stale local main:
+
+```bash
+git fetch origin main --quiet
+```
+
+Run `git diff origin/main` to get the full diff. This includes both committed and uncommitted changes against the latest main.
+
+---
+
+## Step 4: Two-pass review
+
+Apply the checklist against the diff in two passes:
+
+1. **Pass 1 (CRITICAL):** SQL & Data Safety, LLM Output Trust Boundary
+2. **Pass 2 (INFORMATIONAL):** Conditional Side Effects, Magic Numbers & String Coupling, Dead Code & Consistency, LLM Prompt Issues, Test Gaps, View/Frontend
+
+Follow the output format specified in the checklist. Respect the suppressions — do NOT flag items listed in the "DO NOT flag" section.
+
+---
+
+## Step 5: Output findings
+
+**Always output ALL findings** — both critical and informational. The user must see every issue.
+
+- If CRITICAL issues found: output all findings, then for EACH critical issue use a separate AskUserQuestion with the problem, your recommended fix, and options (A: Fix it now, B: Acknowledge, C: False positive — skip).
+  After all critical questions are answered, output a summary of what the user chose for each issue. If the user chose A (fix) on any issue, apply the recommended fixes. If only B/C were chosen, no action needed.
+- If only non-critical issues found: output findings. No further action needed.
+- If no issues found: output `Pre-Landing Review: No issues found.`
+
+---
+
+## Important Rules
+
+- **Read the FULL diff before commenting.** Do not flag issues already addressed in the diff.
+- **Read-only by default.** Only modify files if the user explicitly chooses "Fix it now" on a critical issue. Never commit, push, or create PRs.
+- **Be terse.** One line problem, one line fix. No preamble.
+- **Only flag real problems.** Skip anything that's fine.