feat(server): add Linear workflow state operations

[siisee11]

One-Line Summary

Linear source connections can discover team workflow states and move existing issues between them.

User-Facing Changes

• Adds list_workflow_states for read and read-write Linear connections; callers provide teamId and receive the team's workflow state IDs and metadata.
• Adds update_issue for read-write Linear connections; callers provide issueId and stateId to change an issue's workflow state.
• Keeps update_issue unavailable to mention-only and read-only connections.

Why This Changed

The Linear adapter exposed issue state data and allowed a state during issue creation, but it had no operation to discover a team's available states or update an existing issue. Agents therefore could not complete a normal issue status transition through the audited Source API.

How It Changed

• Adds strict Zod inputs for workflow-state lookup and issue-state updates.
• Maps list_workflow_states to Linear's team.states GraphQL query.
• Maps update_issue to Linear's issueUpdate mutation with IssueUpdateInput.stateId.
• Bumps the Linear descriptor version to linear.v2 and adds CLI examples and access-mode notes.
• Adds happy-path and invalid-input coverage for both operations.

Extra Context / Decisions (Optional)

update_issue is intentionally limited to workflow-state changes in this PR. Other IssueUpdateInput fields can be added later with explicit validation and policy review.

Verification

• bun run format
• bunx oxlint --type-aware --type-check packages/server/src/source-api/adapters/linear.ts packages/server/src/source-api/adapters/linear.test.ts
• bun run typecheck from packages/server
• bun run test from packages/server — 49 test files and 186 tests passed, including workflow-state lookup, issue-state update, and required-input rejection coverage in linear.test.ts.

Video / Screenshot (Optional)

• N/A

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