Retry aggregate-diff review experiment for apache/doris#64080 - #138

…ability (#65178)

The Codex GitHub Actions review pipeline needed stronger guarantees that
agents review the intended PR snapshot, use one authoritative diff,
pursue high-risk cross-module mechanisms, and expose the work of spawned
subagents in Litefuse.

This PR:

- verifies the checked-out PR head and rechecks the live base/head after
context preparation;
- prepares an authoritative aggregate PR patch and changed-file list,
with atomic bounded retry (`2s`, `4s`, `8s`) for transient GitHub API
failures;
- directs the main agent to perform an initial risk scan, dispatch
focused subagents for suspicious mechanisms, maintain a shared
append-only ledger, validate/deduplicate every candidate, and converge
for at most three rounds;
- requires paths outside the authoritative diff/changed-file context to
be confirmed with `rg --files` before reading;
- records separate Litefuse traces for each Codex subagent session,
including command/tool I/O and non-empty encrypted-reasoning status,
instead of mixing subagent activity into the main trace;
- makes Litefuse ingestion more resilient to transport timeouts while
keeping telemetry upload non-blocking for the review outcome.

The repository review skill is kept focused on review invariants;
orchestration and completion policy live in the workflow prompt, where
they are available to the GitHub Actions invocation.

### Validation and experiment material

- Static checks: `python3 -m py_compile
.github/scripts/emit_litefuse_otel_io.py` and `git diff --check`.
- Litefuse uploader validation: real/synthetic subagent session
conversion, payload-limit coverage, and readback of independent subagent
traces.
- End-to-end replayed review experiments against fresh fork PRs built
from the original PR base/head commits:

| Replay PR | GitHub Actions run | Result |
| --- | --- | --- |
| [#136](zclllyybb#136) |
[29112823062](https://github.com/zclllyybb/doris/actions/runs/29112823062)
| Success; 2 inline comments |
| [#137](zclllyybb#137) |
[29114260631](https://github.com/zclllyybb/doris/actions/runs/29114260631)
| Success; 3 inline comments |
| [#138](zclllyybb#138) |
[29115946034](https://github.com/zclllyybb/doris/actions/runs/29115946034)
| Success; 1 inline comment |
| [#139](zclllyybb#139) |
[29150372758](https://github.com/zclllyybb/doris/actions/runs/29150372758)
| Success; 1 inline comment |
| [#140](zclllyybb#140) |
[29151057520](https://github.com/zclllyybb/doris/actions/runs/29151057520)
| Success; 1 inline comment |

The latest replay trace, `86be226391a40e5992bb8d3b4e125eca`, confirms
one authoritative `pr.diff` read, two changed-file-list reads, no `gh pr
diff` or `git diff` calls from the reviewing agent, and separate
subagent sessions. It also exposed one remaining prompt-compliance gap:
a guessed adjacent `.cpp` path was read without a preceding `rg --files`
lookup; this is documented test evidence rather than hidden by the
validation.