🐛 fix: include edited comments in incremental timelines

[SigureMo]

Incremental timeline reads with --after skipped older comments edited after the previous read. Include the latest body edits in PR/issue comments, review bodies, and thread comments, while preserving original event timestamps, ordering, and IDs. Show edit timestamps separately and retain thread context; folded reviews keep an edit summary and an expansion command.

--before alone retains its existing event-time behavior. Issue follow-ups now scan older pages because an old comment can have a recent edit. The README and skill explain that the output contains current text and its latest edit time.

Validation:

• All 169 tests passed, including edit-window boundaries, older issue pages, thread context, per-comment counts, and folded content.
• Type, lint, format, and extension entrypoint checks passed.
• Live ✨ feat: render native GitHub pull request stacks #82 reproduction: the comment created at 15:56:37 UTC and edited at 16:06:10 now appears in the 16:00–16:07 window, retaining event number 5 and its original timestamp.

^{This PR is co-authored with @codex (gpt-6 astra ultra)}

[chatgpt-codex-connector]

Summary

• Documented that comment-expand and review-expand retain GitHub’s latest edit timestamp, preserving edit provenance alongside expanded current content. README.mdL172-L176
• Extended the mock GitHub responses with edited timestamps for both pull-request and issue comments. tests/test_cli.pyL341-L370
• Added regression assertions verifying that PR and issue comment expansion renders the corresponding Edited metadata. tests/test_cli.pyL766-L772 tests/test_cli.pyL1886-L1891
• Committed the changes as 6f51149 (test: cover edit metadata in comment expansion) and created the follow-up PR titled “test: preserve edit provenance in expanded comments.”

Testing

• ✅ git diff --check
• ✅ PYENV_VERSION=3.14.4 python -m compileall -q src tests
• ✅ PYENV_VERSION=3.14.4 ruff check .
• ✅ PYENV_VERSION=3.14.4 ruff format --check --diff .
• ✅ prettier --check '**/*.md'
• ⚠️ PYENV_VERSION=3.14.4 uv run pytest && PYENV_VERSION=3.14.4 uv run ty check --error-on-warning src/gh_llm tests && PYENV_VERSION=3.14.4 uv run ruff check . && PYENV_VERSION=3.14.4 uv run ruff format --check --diff . && prettier --check '**/*.md' && PYENV_VERSION=3.14.4 uv run pytest tests/test_extension_entrypoint.py (the environment could not download pluggy==1.5.0 because its network tunnel failed)

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