Add plugin entry: linear

[vburojevic]

What the plugin does

Linear inside bb: a list-first issue browser in the nav panel (state groups, filters, full-text search, keyboard navigation, inbox with badge, two-field create dialog) served from a local SQLite mirror; a deterministic ladder that resolves which Linear issue each bb thread is working on (explicit link > Linear branch name > issue key in conversation > fuzzy suggestion that asks, never binds), shown live in the thread header and side panel and injected into agent instructions; thirteen linear_* agent tools plus a bb linear CLI, identical across providers.

Source release

• https://github.com/vburojevic/bb-plugin-linear.git, range ^0.1.2 (annotated tag v0.1.2, public)
• Installs from source: bb clones, installs dependencies, builds on the user's machine — nothing pre-built ships in the repo

Plugin checks

• tsc --noEmit clean, 742 tests passing (vitest), bb plugin build succeeds
• A machine-local pre-push hook runs the same gate on every push

Marketplace checks

• npm run build and npm run check both pass (64 entries)
• Icon vendored as icons/linear-6ff21144.svg (sha256-prefixed, shape-only SVG, no scripts or remote resources)

Security facts for reviewers

• Credential: a personal Linear API key per workspace, stored in bb's secret store, redacted from every error, log line, tool result and rpc payload at construction
• One consent switch ("Allow changes to Linear") gates every mutation at the single transport door; refusals name the switch
• Every GraphQL document is validated offline against a vendored SDL by the test suite; rate-limit headers are honored with a budget
• Webhooks are optional: registered only after a signed self-test, demoted back to polling on delivery failure

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