Add connector catalog and live GitHub/GitLab/Confluence sources

[Saga4]

Summary

• Add a connector catalog for planned providers while keeping unsupported providers out of the runtime registry.
• Promote GitHub to a live read-only source connector with PAT setup, daemon resolution, CLI/desktop connection flows, and filesystem hydration for repositories, README files, issues, and pull requests.
• Promote GitLab to a live read-only source connector with PAT setup, daemon resolution, CLI/desktop connection flows, and filesystem hydration for projects, README files, issues, and merge requests.
• Promote Confluence to a live read-only source connector with Atlassian site URL, email, API-token setup, daemon resolution, CLI/desktop connection flows, and filesystem hydration for spaces and pages.
• Keep GitHub, GitLab, and Confluence writes blocked until reviewed provider-specific write models exist.
• Document the connector promotion bar, official API references, and current runtime connector status.

Verification

• cargo test -p locality-github
• cargo test -p locality-gitlab
• cargo test -p locality-confluence
• cargo test -p locality-planned-connectors
• cargo test -p localityd --test source_descriptor -- --test-threads=1
• cargo test -p loc-cli connect:: --lib
• cargo test -p loc-cli --lib
• cargo test -p locality-desktop desktop_mount_creation_supports_linear_as_editable_source
• npm --prefix apps/desktop run test -- source-setup --run
• npm --prefix apps/desktop run build

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Project	Deployment	Actions	Updated (UTC)
locality	Ready	Preview, Comment	Jul 28, 2026 5:09pm

[github-actions]

Codex review

• major: apps/desktop/src-tauri/src/main.rs:7850
  create_desktop_mount_blocking supports GitHub/Confluence elsewhere, and connect_github_blocking / connect_confluence_blocking call it, but the remote_root_id match omits "github" and CONFLUENCE_CONNECTOR_ID. Those desktop flows hit the _ => unreachable!() arm, so connecting either source from desktop fails instead of creating the mount.
  Minimal fix: add GitHub and Confluence to the None arm, and add tests that the desktop connect/create path mounts both successfully.

• major: crates/locality-confluence/src/client.rs:88
  list_spaces and list_pages request limit=100 once and return only collection.results; the DTO also drops pagination links/cursors. Confluence sites/spaces with more than 100 spaces or pages will silently omit the remaining content from the Locality filesystem projection.
  Minimal fix: model the collection pagination metadata and loop until there is no next page, with a test covering multiple pages.