[codex] add watch eta and harden managed desktop switching

[Dikevin]

Summary

• add watch-history ETA calculation and quota list cues for saved accounts
• skip unnecessary managed Desktop refreshes and harden force-switch fallback/target validation
• move the managed Desktop remote debugging port higher and refresh README usage guidance

Verification

• npx rstest run tests/cli-read-commands.test.ts --testNamePattern 'CLI Read Commands > list text output uses unified thresholds for low remaining quota signals'
• npx rstest run tests/cli-read-commands.test.ts --testNamePattern 'CLI Read Commands > marks the current account in list text output while keeping the table aligned'
• npx rstest run tests/cli.test.ts --testNamePattern 'CLI > switch --force falls back to force-kill when managed Desktop devtools times out|CLI > switch --force falls back to force-kill when managed Desktop devtools target info is unavailable|CLI > switch --auto --force falls back to force-kill when managed Desktop devtools refresh fails|CLI > switch --force immediately restarts a codexm-managed Desktop session'
• npx rstest run tests/codex-desktop-launch.test.ts
• npx rstest run tests/codex-runtime-read-paths.test.ts
• npx rstest run tests/cli-launch.test.ts
• npm run typecheck