fix: match Codex plugin hooks to supported event fields

[TerminallyLazy]

Codex 0.151 reports warnings when a stop hook declares additionalContextLimit: only startup hooks can emit that context. Keep the limit on SessionStart and SubagentStart, remove it from Stop and SubagentStop, and bump the Codex plugin to 0.3.6 so installed caches refresh.

Validated with the repository package checks, including all four event forwarders and suppression when managed project hooks own the lifecycle. The warning was observed through the installed Codex host's hooks/list API. This changes plugin packaging only; CLI 0.15.6 remains the runtime release.

High-level PR Summary

This PR fixes a Codex 0.151 compatibility issue by removing the additionalContextLimit field from stop hooks (Stop and SubagentStop events) since only startup hooks can emit additional context. The field is correctly retained on SessionStart and SubagentStart hooks. The plugin version is bumped from 0.3.5 to 0.3.6 to refresh installed caches, and validation tests are updated to match the new hook configuration.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	plugins/tree-ring-memory/.codex-plugin/plugin.json
2	plugins/tree-ring-memory/packaging/codex-skills-only/.codex-plugin/plugin.json
3	plugins/tree-ring-memory/README.md
4	plugins/tree-ring-memory/hooks/codex-hooks.json
5	scripts/validate-plugin-packages.py

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📥 Commits

Reviewing files that changed from the base of the PR and between c807d3f and 1a88e2f.

📒 Files selected for processing (5)

• plugins/tree-ring-memory/.codex-plugin/plugin.json
• plugins/tree-ring-memory/README.md
• plugins/tree-ring-memory/hooks/codex-hooks.json
• plugins/tree-ring-memory/packaging/codex-skills-only/.codex-plugin/plugin.json
• scripts/validate-plugin-packages.py

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