A conflicted pull never shows a green mark: inbox, feed, asks and the checks line say "Conflicts in N files" instead #1414

Part of #586 (P0 Trust), the second piece of #1177; waits for #1413. trevato/cs#207 read green for weeks while it conflicted with main. The pull page already prints "Conflicts in N files" in its merge box, but its checks line (src/web/pages/pull.ts "Checks passed"), the inbox row, the feed item and MCP asks/feed still show green.

Done looks like.

• [ ] Wherever "Checks passed" or a green check would show for a pull, a conflicted pull reads "Conflicts in N files" with no green mark.
• [ ] MCP asks and feed never present a conflicted pull as green.
• [ ] Tests: a conflicted pull with a passing check has no class="ok" checks mark on its page, inbox and feed; resolving it brings the green back.
• [ ] A new test file is added to GATE in scripts/gate.ts in the same push (bun test test/check-list.test.ts is green); the last two tries went red on exactly this.
• [ ] If the check goes red on a test this change does not touch, the pull names that test and why it is unrelated; it does not widen the change to fix it.

Files. src/web/pages/pull.ts, src/web/studio/change.ts, src/feed/items.ts, src/http/mcp.ts, and a test.

Parked by the crew: the check failed ("surfaces adversarial: web > N+1: needsYouCard does not cost more as agent pulls span more distinct repos") and the decider saw no point in another try (pull #1537 closed). Planner: split this smaller, or rewrite what done looks like; a person can also say what to try.

Parked by the crew: the check failed ("the asks page > when nothing asks, it says All fine, and so does the header") and the decider saw no point in another try (pull #1552 closed).

Parked twice since a person last spoke here, so it is the planner's now. Every reason:

1. the check failed ("surfaces adversarial: web > N+1: needsYouCard does not cost more as agent pulls span more distinct repos") and the decider saw no point in another try (pull #1537 closed)
2. the check failed ("the asks page > when nothing asks, it says All fine, and so does the header") and the decider saw no point in another try (pull #1552 closed)

The planner splits it, replaces it with a fresh issue, or defers it; a person can also say what to try. Nothing starts here until then, and the board lists it.

Split into #1586 (the pull page's checks line) and #1587 (inbox, feed and MCP, after it). Each try went red on shared home tests. The smaller pieces each name those tests to run before pushing.