Upstream Faire's Gradle support to rtk-ai/rtk

[Nava2]

Summary

Upstream the Faire fork's Gradle build tool support (~2,836 lines across 10 Rust files + 13 fixtures + 16 snapshots) to rtk-ai/rtk. This is our fork's only material divergence from upstream.

Current state: Fork synced with upstream 0.30.0. Upstream develop at v0.31.0 with Copilot hooks, Gemini CLI, OpenClaw, emoji removal.

Precedent: Upstream accepts large single-PR features — .NET support was 4,284 insertions (rtk-ai#172), Python/Go was 2,053 insertions (rtk-ai#88). No RFC needed.

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Plan (Revised)

Phase 1: Fork alignment PR → Faire/rtk:master ✅

PR: #22 (merged)

• Restored LimitsConfig alongside GradleConfig
• Removed unused _is_integration parameter
• Deleted dead is_integration_test() and is_integration_task_name()

Phase 2: .rtk.toml repo-level config → rtk-ai/rtk:develop ✅

PR: rtk-ai#707 (draft)

• RepoConfig struct with hooks, filters, gradle sections
• find_repo_config_from() walks up to .git boundary
• Config::load_from_dir() merges user + repo config

Phase 3: Gradle module → Graphite stack on rtk-ai/rtk:develop

One filter per PR, following upstream's scope rules. Tooling not enabled until 3j so no user-facing changes mid-stack.

PR	Branch	Scope	Savings	Status
3a	feat/gradle-config	GradleConfig struct + RepoConfig	—	✅ Done
3b	feat/gradle-core	Core module + global noise filters + main.rs wiring + insta dev-dep	70-90%	✅ Done
3c	feat/gradle-compile	Compile filter (kapt/KSP noise, path normalization)	85%+	✅ Done
3d	feat/gradle-test	Test filter (stack trace truncation, framework frame dropping)	90%+	🔄 Next
3e	feat/gradle-detekt	Detekt filter (violation grouping by rule)	85%+	⬜
3f	feat/gradle-health	Health filter (passthrough after global)	80%	⬜
3g	feat/gradle-proto	Proto filter (extraction noise)	75%+	⬜
3h	feat/gradle-deps	Deps filter (tree depth truncation)	40%+	⬜
3i	feat/gradle-batch	Batch multi-task processing	95%+	⬜
3j	feat/gradle-discover	Enable discover rule, remove gradle.toml	—	⬜

Stack Structure

feat/gradle-discover   (3j) — discover rule + remove TOML filter
feat/gradle-batch      (3i) — batch multi-task processing  
feat/gradle-deps       (3h) — deps filter
feat/gradle-proto      (3g) — proto filter
feat/gradle-health     (3f) — health filter
feat/gradle-detekt     (3e) — detekt filter
feat/gradle-test       (3d) — test filter
feat/gradle-compile    (3c) — compile filter
feat/gradle-core       (3b) — core module + global filters + wiring
feat/gradle-config     (3a) — GradleConfig struct
feat/repo-config       (PR #707) — .rtk.toml support

Notes

• Upstream PRs opened as drafts to invite early feedback
• All commits DCO signed (git commit -s)
• insta crate added as dev-dependency in 3b (flagged as open question for upstream maintainer)
• After upstream merge, evaluate fork version strategy