fix(codex): preserve Windows focus helper and clarify installation

[777genius]

Codex setup copied the notification executable but omitted the Windows GUI focus helper downloaded by install.sh. After bootstrap removed staging, toast clicks fell back to the console executable and could flash a console window. Preserve the exact amd64/arm64 focus helper names in the stable runtime copy.

README now separates Claude and Codex post-install/update steps, directs each product to its own manual fallback, and removes the incorrect once-only download claim. Codex hook registration is automatic; trust approval is still manual.

Validation: hosted isolated go test ./internal/codexsetup passes. Copy regression coverage verifies both Windows helper architectures and rejects an unsupported Linux helper. Independent read-only review found no actionable correctness defects. Final commit 446c0d6 passed all six Ubuntu/macOS/Windows jobs on Go 1.22/1.26, lint and Swift tests. Runs: Ubuntu 34326940595, macOS 34326940895, Windows 34326940558.

A separate interactive curl-pipe E2E on the merged bootstrap and real v1.42.0 draft binary selected Codex twice, verified automatic hook registration and preservation of foreign hooks/settings, executed the exact registered Stop command, and captured one webhook. This proves the installer path, not Windows GUI focus or interactive Codex trust. The existing v1.42.0 draft predates this fix and must not be treated as qualified for publication without an updated candidate.

Related: #142, #141.

CI exposed an existing cross-package fixture collision: hook tests remove test-session files from the shared system temporary directory while the state workflow test uses that directory. State tests now own a t.TempDir per manager. Five repeated state suite runs passed under an unprivileged hosted sandbox user, retaining permission-denied coverage. Production state code is unchanged.

Expanded real E2E also passed menu choice 3 (both), twice: actual Claude CLI installed from a disposable local marketplace, Codex registered automatically, and the exact registered Stop command delivered one webhook. Only sandbox profiles and loopback-mirrored actual draft artifacts were used.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.44%. Comparing base (abd885f) to head (446c0d6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
+ Coverage   60.43%   60.44%   +0.01%     
==========================================
  Files          60       60              
  Lines        6581     6583       +2     
==========================================
+ Hits         3977     3979       +2     
  Misses       2290     2290              
  Partials      314      314              

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