Separate project-context discovery from display-only repository browsing

[moirahuang]

Description

• Stack this follow-up above Support remote project rules through repo metadata standing results #11460, which now owns normal direct project-rule discovery and the typed remote project-rule snapshot transport.
• Keep repository-wide metadata authoritative: indexing failures remain failures rather than shallow successful trees, while lazy display trees provide separate local and remote browsing recovery.
• Route local project skills and project rules through authoritative metadata when indexing succeeds and filesystem fallback only after authoritative indexing fails; extend project-rule publication with failed-index fallback without reintroducing normal tree-backed discovery.
• Publish and consume typed remote project-skill replacement snapshots, while preventing display-only remote file-tree snapshots from becoming a project-context source.
• Align production-style SkillManager test fixtures with its RemoteServerManager runtime-source subscription dependency exposed by the restack.

Linked Issue

No linked issue was provided for this stacked draft follow-up.

Testing

• ./script/format

• cargo test -p warp --lib ai::agent_sdk::driver::tests::split_loading_env_loads_all_global_loads_subset -- --nocapture

• cargo test -p warp --lib ai::skills -- --nocapture

• cargo test -p warp --lib metadata_project_rules

• cargo test -p ai --features local_fs project_context

• cargo test -p warp --lib remote_server::server_model::tests

• cargo test -p warp --lib skill_watcher

• ./script/presubmit

• I have manually tested my changes locally with ./script/run (not run; focused model, watcher, daemon, fixture-regression, and full presubmit validation were run for this branch).

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

Agent Artifacts

• Conversation: https://staging.warp.dev/conversation/dd300173-8538-4d9f-85d1-beeffa00b8bb
• Reorder plan: https://staging.warp.dev/drive/notebook/jATYCff51aSDIIXFKWciVr
• Design plan: https://staging.warp.dev/drive/notebook/N8ECz4kVfIJjgSZZDzdKON

Co-Authored-By: Oz oz-agent@warp.dev

[moirahuang]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Separate project-context discovery from display-only repository browsing #11921 👈 (View in Graphite)
• Support remote project rules through repo metadata standing results #11460
• Create standing results to track project skills and project rules #12047 : 1 other dependent PR (#12051 )
• Add max result limit to get_repo_contents #12035
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

[moirahuang]

Superseded by #12047 and the revised stack design. Project-context discovery now moves through the foundational authoritative repo-metadata query PR, and project rules will be restacked above that foundation separately.