Update README project structure

[cohogan]

Audited the README against the current codebase. Almost everything was accurate; two spots had drifted:

• src-tauri/src/ structure was missing diagnostics.rs (network diagnostics) and http_client.rs (shared HTTP client)
• src/hooks/ listing was missing use-session-context

Verified accurate as-is: features list (notify watcher, CRC32C, 30s heartbeat, glob ignore patterns, updater), tech stack versions (React 19, Vite 8, Tailwind v4), dev port 1420, pnpm types endpoint, pairing flow endpoints (get-code, poll-pairing), CI/CD description, and VITE_SERVER_URL.

Also bumps version to 0.2.1 per repo convention. Note: merging will draft an app-v0.2.1 release — leave it unpublished until the 0.2.0 auto-update test is done, since the updater only sees published releases.

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[github-actions]

Claude finished @cohogan's task in 49s —— View job

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Code Review: PR #28

• Review diff and verify changes
• Verify README accuracy against codebase
• Check version bump consistency
• Post review findings

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Looks good. Clean, accurate PR — no issues found.

README additions verified against codebase:

• diagnostics.rs exists and does network diagnostics (connectivity checks) — description accurate
• http_client.rs exists and provides a shared reqwest::Client + response helpers — description accurate
• use-session-context.tsx exists in src/hooks/ — confirmed
• main.rs is intentionally omitted from the listing (standard Tauri entry point) — reasonable

Version bump (0.2.0 → 0.2.1) consistent across all three locations:

• package.json:4 ✓
• src-tauri/Cargo.toml:3 ✓
• src-tauri/tauri.conf.json:4 ✓
• src-tauri/Cargo.lock updated to match ✓

One note from the PR description worth flagging for the merge: the author correctly notes that merging will draft an app-v0.2.1 release — leave it unpublished until the 0.2.0 auto-update test completes.

No changes requested. LGTM.