fix(codex): handle large sessions and correct skill invocation

[and0rw]

Summary

• Avoid V8's argument limit when the Codex session analyzer aggregates a large session.
• Correct Codex Desktop and Codex CLI Better Harness invocation examples in both READMEs.

Why

• Issue/Story: None provided.
• User or maintainer outcome: Large Codex sessions complete analysis instead of throwing RangeError: Maximum call stack size exceeded; Codex users receive host-specific invocation syntax.

Traceability and Scope

• Spec/ADR, if applicable: None. This is a narrow maintenance fix.
• Acceptance criteria addressed:
  • A synthetic 150,000-event Codex session analyzes successfully and preserves aggregate and per-session event counts.
  • Codex Desktop examples use @better-harness and Codex CLI examples use $better-harness:better-harness in English and Simplified Chinese.
  • Other hosts' /better-harness examples remain unchanged.
• Canonical owners changed: scripts/session-analysis/platforms/codex.mjs, README.md, README.zh-CN.md, and focused regression tests.
• Explicit non-goals: Changes to other provider analyzers, SKILL.md, plugin manifests, generic slash-command examples, and release metadata.

Change Type

• Bug fix
• Feature
• Tests only
• Documentation/community
• Refactor with no intended behavior change
• Dependency, packaging, or infrastructure

Test and Review Evidence

Check	Result
node --test test/session-analysis.test.mjs test/session-analysis-core-facts.test.mjs test/better-harness-evidence-bundle.test.mjs test/better-harness-skill.test.mjs	Passed
npm test	Passed: 835 tests
npm run pack:verify	Passed: npm 303 entries, runtime ZIP 330 entries
Codex CLI smoke test	Passed: $better-harness:better-harness returned BETTER_HARNESS_CLI_SMOKE_OK in an ephemeral read-only task

Manual or visual evidence: the Codex Desktop Better Harness skill resolved in the active task; the CLI invocation was exercised with Codex CLI 0.145.0.

Risk and Recovery

• Compatibility and cross-platform impact: The analyzer change is standard JavaScript array iteration; documentation is host-specific and leaves other host syntax unchanged.
• Package, plugin, schema, or generated-file impact: No manifest, schema, or generated-file changes; package verification passed.
• Rollback or recovery path: Revert 6afe786 and/or 4d14212 independently.
• Residual risk or unverified boundary: Maintainer review remains pending; no changes were made to analogous non-Codex aggregation paths.

AI Involvement

• Level: Generated
• Human review and validation: Maintainer review pending; automated validation is listed above.

Checklist

• I followed AGENTS.md, CONTRIBUTING.md, and the relevant canonical-owner guidance.
• The change is focused and does not include unrelated local or generated state.
• Tests and documentation match the behavior actually delivered.
• Markdown links were checked when documentation changed.
• Cross-platform behavior was considered for Windows, macOS, and Linux.
• Package/runtime verification was run when shipped files or dependencies changed.
• User-facing or compatibility changes are recorded in CHANGELOG.md (documentation correction only; out of scope for this PR).
• I have the right to contribute this work under the repository's MIT License.