fix: pre-landing review fixes

Review army + red team findings, all verified before applying:
- ship-docsync E2E now asserts run_in_background === false on the
  captured dispatch (red team CRITICAL: phrase pins prove text exists,
  this proves the model obeys it — verified passing live).
- Structural scanner test: any generated file with an Agent-dispatch
  imperative (or bare '(foreground)' prose, the #2440 inert shape) must
  carry the flag or hold a reasoned exemption — the 4th-recurrence net
  the hand-enumerated pin list can't provide.
- Parent push reconciliation models reality: the parent shares the repo,
  so a non-fast-forward that hit the subagent hits the parent identically
  — fetch + ahead/behind check first, push only when the rejection was
  transient; dispatch prompt promise softened to 'the parent will handle
  it'.
- Recovered commits from a dead subagent are vetted docs-only
  (git show --stat, never VERSION/package.json) before any push.
- Deadline pacing named: ~3 minutes between checks, wall clock not polls.
- Greptile UNAVAILABLE recording narrowed to the PR body (Step 20's
  schema carries no triage field).
- document-release contract gains the echo-failure tie-breaker: prompt
  claims spawned + no echo → fail fast with the dispatch contract's
  failure shape instead of reproducing the #2733 prose-STOP; contract
  anti-injection and NEVER-relax clauses pinned in tests.
- 'Claude Code v2.1.198' extracted to CC_BACKGROUND_DEFAULT_SINCE and
  interpolated at all resolver sites (byte-identical output).
- CHANGELOG: entry-boundary blank line restored; worst-case-wait row
  scoped to the backgrounded path.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

scripts/resolvers/design.ts

@@ -1,5 +1,5 @@
 import { type TemplateContext, toShellPath } from './types';
-import { AI_SLOP_BLACKLIST, OPENAI_HARD_REJECTIONS, OPENAI_LITMUS_CHECKS, CODEX_WEB_SEARCH_FLAG } from './constants';
+import { AI_SLOP_BLACKLIST, OPENAI_HARD_REJECTIONS, OPENAI_LITMUS_CHECKS, CODEX_WEB_SEARCH_FLAG, CC_BACKGROUND_DEFAULT_SINCE } from './constants';
 
 export function generateDesignReviewLite(ctx: TemplateContext): string {
   const litmusList = OPENAI_LITMUS_CHECKS.map((item, i) => `${i + 1}. ${item}`).join(' ');
@@ -531,7 +531,7 @@ codex exec "For this product approach, provide: a visual thesis (one sentence
 \`\`\`
 Use a 5-minute timeout (\`timeout: 300000\`). After completion: \`cat "$TMPERR_SKETCH" && rm -f "$TMPERR_SKETCH"\`
 
-2. **Claude subagent** (via Agent tool, \`run_in_background: false\` — subagents default to background since Claude Code v2.1.198):
+2. **Claude subagent** (via Agent tool, \`run_in_background: false\` — subagents default to background since ${CC_BACKGROUND_DEFAULT_SINCE}):
 "For this product approach, what design direction would you recommend? What aesthetic, typography, and interaction patterns fit? What would make this approach feel inevitable to the user? Be specific — font names, hex colors, spacing values."
 
 Present Codex output under \`CODEX SAYS (design sketch):\` and subagent output under \`CLAUDE SUBAGENT (design direction):\`.
@@ -704,7 +704,7 @@ Use a 5-minute timeout (\`timeout: 300000\`). After the command completes, read
 cat "$TMPERR_DESIGN" && rm -f "$TMPERR_DESIGN"
 \`\`\`
 
-2. **Claude design subagent** (via Agent tool, \`run_in_background: false\` — subagents default to background since Claude Code v2.1.198):
+2. **Claude design subagent** (via Agent tool, \`run_in_background: false\` — subagents default to background since ${CC_BACKGROUND_DEFAULT_SINCE}):
 Dispatch a subagent with this prompt:
 "${subagentPrompt}"