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/src/index.ts

@@ -66,7 +66,9 @@ export function parseResumeArg(
     if (arg === RESUME_FLAG || inlineValue) {
       if (resumeSessionId !== undefined) throw new Error(`${RESUME_FLAG} may be given only once`)
       const value = inlineValue ? arg.slice(RESUME_FLAG.length + 1) : argv[i + 1]
-      if (value === undefined || value === '') {
+      // A following token that is itself resume syntax (`--resume --resume x`)
+      // is a missing id, not a session literally named `--resume…`.
+      if (value === undefined || value === '' || value === RESUME_FLAG || value.startsWith(`${RESUME_FLAG}=`)) {
         throw new Error(`${RESUME_FLAG} requires a session id (e.g. ${RESUME_FLAG} <session-id>)`)
       }
       resumeSessionId = value

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', () => {