feat(rust): port ci git-refs and ci queue-info to native Rust (Phase 1.6)

[jd]

Adds github_event (GitHub Actions event payload deserialization) and
queue_metadata (MQ YAML fenced-block extraction) shared modules to the
mergify-ci crate, and ports two commands on top of them:

• ci queue-info — prints MQ batch metadata as pretty JSON; errors
  INVALID_STATE (exit 7) outside an MQ context. Appends to
  $GITHUB_OUTPUT with the same ghadelimiter_<uuid> heredoc the
  Python version uses.

• ci git-refs — detects base/head refs from Buildkite env, GitHub
  event payload, refs/notes/mergify/<branch> git notes, MQ PR body,
  or falls back to HEAD^..HEAD. Supports text/shell/json
  output formats, writes base/head to $GITHUB_OUTPUT, and calls
  buildkite-agent meta-data set when BUILDKITE=true.

The notes reader is injected as a trait-object callback so unit tests
can exercise the note-driven detection path without touching a real
git repository; the production path shells out via
real_notes_reader.

PORT_STATUS.toml flips both entries to native. The looks-native
heuristic in main.rs learns the two new subcommand names so argv
errors surface as clap exit 2 instead of silently falling through to
the Python shim.

Adds serde_yaml_ng (YAML parser) and uuid (ghadelimiter) deps to
the mergify-ci crate. Binary grows ~100KB to 8.6MB.

19 new Rust tests (8 event/metadata, 3 queue-info, 12 git-refs + 2
format round-trips merged in). Full workspace: 79 tests green,
compat harness 4/4, port-inventory guard 4/4.

Depends-On: #1301

[jd]

This pull request is part of a Mergify stack:

#	Pull Request	Link
1	feat(rust): add mergify-core foundation types (Phase 1.2a)	#1280
2	feat(rust): add mergify-core::http with retry + typed errors (Phase 1.2b)	#1281
3	feat(rust): port config validate to native Rust (Phase 1.3)	#1282
4	test: add port-inventory guard to catch un-ported Python commands	#1296
5	ci: add Rust release workflow targeting GitHub Release assets	#1297
6	feat(rust): port config simulate to native Rust (Phase 1.3b)	#1298
7	feat(rust): port ci scopes-send to native Rust (Phase 1.4)	#1300
8	feat(rust): port queue pause and unpause to native Rust (Phase 1.5)	#1301
9	feat(rust): port ci git-refs and ci queue-info to native Rust (Phase 1.6)	#1302	👈

[mergify]

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• depends-on = Mergifyio/mergify-cli#1301 [⛓️ feat(rust): port queue pause and unpause to native Rust (Phase 1.5) #1301 (queued)]

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• depends-on = Mergifyio/mergify-cli#1301 [⛓️ feat(rust): port queue pause and unpause to native Rust (Phase 1.5) #1301 (queued)]

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[jd]

Revision history

#	Type	Changes	Date
1	initial	8cb0904	2026-04-24 13:41 UTC
2	rebase	8cb0904 → 45e5380	2026-04-24 13:41 UTC