fix: address PR #504 review warnings

- workspace-context: a transiently unavailable but still-effective candidate
  keeps its cached trimmed digest in the directory's dedup slot, so an
  identical later sibling is not emitted as a duplicate set until the next
  successful reconciliation
- app-boot: --resume rejects a following token that is itself resume syntax
  instead of accepting it as a session id
- tui: the queued-steering badge tracks per-entry sources and a drain removes
  one matching entry, so loop-authored steering (no agent/queued) cannot
  consume a pending user message's slot

packages/ui/app-boot/tests/app-boot.spec.ts

@@ -48,6 +48,11 @@ describe('parseResumeArg', () => {
     expect(() => parseResumeArg(['--resume='])).toThrow('--resume requires a session id')
     expect(() => parseResumeArg(['--resume', 'a', '--resume', 'b'])).toThrow('--resume may be given only once')
   })
+
+  it('rejects resume syntax used as the flag value instead of resuming a session named like the flag', () => {
+    expect(() => parseResumeArg(['--resume', '--resume', 'sess'])).toThrow('--resume requires a session id')
+    expect(() => parseResumeArg(['--resume', '--resume=sess'])).toThrow('--resume requires a session id')
+  })
 })
 
 describe('loadEnv', () => {