Issues addressed:
1. guided-flow.ts: Remove 12 unnecessary 'ctx as any' casts
- ctx is already ExtensionCommandContext, matching showNextAction/showConfirm signatures
- The casts masked type-checking with no benefit
2. triage-ui.ts: Remove 1 unnecessary 'ctx as any' cast (same issue as #1)
3. migrate/command.ts: Remove 2 unnecessary 'ctx as any' casts (same issue as #1)
4. models-resolver.ts: Remove dead exports hasBothModelsFiles() and getModelsPaths()
- Never imported outside the module or in any test file
- resolveModelsJsonPath() (the only consumer) remains
5. resource-loader.ts: Remove dead export readManagedResourceSyncedAt()
- Exported but never imported anywhere in the entire codebase
6. bg-shell/overlay.ts: Extract processStatusHeader() helper
- DRYs the duplicated status icon + name + uptime + tab indicator
construction shared between renderOutput() and renderEvents()
7. get-secrets-from-user.ts: Merge duplicate vercel/convex deployment blocks
- Both had identical exec → check result code → push applied/errors pattern
- Merged into single conditional with destination-specific command string
Documented but not changed (boundary constraints):
- src/mcp-server.ts ↔ src/resources/extensions/gsd/mcp-server.ts
(compiled/jiti boundary prevents sharing)
- src/remote-questions-config.ts ↔ remote-questions/remote-command.ts
(same compiled/jiti boundary per #592)
- cli.ts internal duplication of session setup (structural, different resource loader configs)
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