docs: confirm codex reinstall repair in troubleshooting

Reinstalling @openai/codex restored the missing native binary and kept
the ChatGPT login (auth lives under ~/.codex, outside the npm package).
Troubleshooting now includes the post-reinstall verification steps.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: divitsheth

README.md

@@ -287,8 +287,13 @@ If that fails with the same `spawn ... ENOENT`, reinstall the Codex CLI:
 
 ```bash
 npm install -g @openai/codex
+codex --version       # confirm the binary runs
+codex login status    # confirm you are still signed in
 ```
 
+Reinstalling does not sign you out: codex keeps its login under `~/.codex`,
+outside the npm package.
+
 Or switch CodeAlmanac to the Claude harness instead:
 
 ```bash

docs/bugs/codealmanac-known-bugs.md

@@ -27,6 +27,11 @@ install/update or a disk cleanup). `codex --version` run directly fails with
 the exact same spawn ENOENT, so every codex invocation on this machine fails,
 not just ours. codealmanac correctly surfaced a real harness failure.
 
+**Repaired 2026-07-07:** `npm install -g @openai/codex` restored the binary in
+seconds (`codex-cli 0.142.5`) and the ChatGPT login survived — codex keeps
+auth under `~/.codex`, outside the npm package. The README troubleshooting
+entry documents this repair.
+
 ### S2. `init` does not preflight the configured harness before starting the build job — FIXED 2026-07-07
 
 `init` announced the job id, printed the tagline ("every codebase deserves a