feat(rust): port queue status to native Rust

[jd]

The Rust binary now serves mergify queue status natively. The
Python implementation (mergify_cli/queue/cli.py:status plus the
batch/scope/topology helpers it depended on) is removed in the
same PR — the port-and-delete rule we adopted in #1322 keeps a
single live copy of every command.

This change also introduces the mergify-tui crate. The
colored-tree rendering primitives are written there from the
start (Theme + relative-time formatter + box-drawing
characters) rather than inlined in status.rs and extracted
later — they're general-purpose and will be needed by every
command with structured human output (queue show,
freeze list, future ports).

mergify queue status [-r REPO] [-t TOKEN] [-u URL] [-b BRANCH] [--json]:

1. Resolves repository / token / API URL via the shared
   mergify_queue::auth resolver introduced in feat(rust): port queue pause and unpause to native Rust #1352.
2. Fetches GET /v1/repos/<repo>/merge-queue/status, optionally
   with ?branch=<branch> (URL-encoded via
   url::form_urlencoded::byte_serialize).
3. With --json: pretty-prints the raw response. The schema is
   Mergify's API contract, not this CLI's, so we deserialize into
   serde_json::Value and emit verbatim — unknown fields and
   future schema additions survive the round trip.
4. Without --json: deserializes into a typed StatusView
   that uses #[serde(default)] Option<…> for every field the
   Mergify API has historically treated as optional/nullable
   (matches the port checklist from docs(port): add port review checklist for HTTP/test/UX parity pitfalls #1357), then renders a
   header, an optional pause indicator, the batch tree (grouped
   by scope when there is more than one), and the waiting-PR
   list. Status icons (● ◑ ◌ ✓ ✗ ◎ ⏳ ↻ ⏰ ❄), tree
   characters (├── └── │ ), and relative times
   (5m ago / ~1h) match the Python implementation.

The mergify-tui crate has three modules:

• theme: Theme struct with TTY/NO_COLOR-aware
  enable/disable. Pre-built named styles (bold, dim,
  cyan/green/red/yellow/magenta, warn)
  plus a fg(AnsiColor) helper for domain-specific palettes.
  Theme::detect is the production constructor;
  Theme::new(enabled) is for tests.
• time: relative_time(iso, now, future) — coarse
  Ns/Nm/Nh/Nd formatter mirroring the Python
  CLI's _relative_time. Empty string on parse failure so a
  malformed timestamp doesn't abort the surrounding render.
• tree: Unicode box-drawing constants (BRANCH,
  LAST_BRANCH, CONTINUATION, LAST_CONTINUATION) plus
  branch_chars(is_last) to pick both prefixes for a row in
  one call.

Tests:

• mergify-tui: 11 tests (theme on/off, relative-time units +
  parse failure + future prefix, tree-character pairing).
• build_path covers no-branch, branch, and URL-encoding of a
  branch name with slashes + spaces.
• topological_sort covers parents-before-children ordering
  and tolerance of parent_ids that reference missing batches.
• group_by_scope covers the [] → "default" fallback
  and multi-scope batches appearing under each scope they claim.
• status_icon covers known + unknown codes.
• End-to-end wiremock tests: empty queue, paused queue, batches +
  waiting PRs, multi-scope grouping, ?branch=… query
  threading, JSON-passthrough preserving an extra_field,
  and tolerance of a response that omits all optional fields.

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

Depends-On: #1353

[jd]

This pull request is part of a Mergify stack:

#	Pull Request	Link
1	fix(cli): surface clap's --help instead of erroring on native subcommands	#1380
2	feat(rust): port queue pause and unpause to native Rust	#1352
3	feat(rust): port ci git-refs and ci queue-info to native Rust	#1353
4	feat(rust): port queue status to native Rust	#1359	👈
5	test: derive native queue commands from the binary, not a hardcoded list	#1366

[mergify]

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• depends-on=Mergifyio/mergify-cli#1352 [⛓️ feat(rust): port queue pause and unpause to native Rust #1352 [stack]]
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• depends-on=Mergifyio/mergify-cli#1353 [⛓️ feat(rust): port ci git-refs and ci queue-info to native Rust #1353 [stack]]
• depends-on=Mergifyio/mergify-cli#1380 [⛓️ fix(cli): surface clap's --help instead of erroring on native subcommands #1380 [stack]]

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[jd]

Revision history

#	Type	Changes	Reason	Date
1	initial	ef75ea5		2026-05-05 13:13 UTC
2	rebase	ef75ea5 → d733d15		2026-05-05 13:13 UTC
3	content	d733d15 → aa25245		2026-05-05 13:22 UTC
4	content	aa25245 → 53d4832		2026-05-05 15:18 UTC
5	content	53d4832 → e7ad85a		2026-05-05 19:59 UTC
6	rebase	e7ad85a → 4be1b66		2026-05-06 10:57 UTC
7	content	4be1b66 → d75104b		2026-05-06 13:00 UTC
8	content	d75104b → e7408de		2026-05-07 13:40 UTC
9	rebase	e7408de → e9b1c70		2026-05-07 15:17 UTC
10	content	e9b1c70 → 439025b		2026-05-07 18:21 UTC