fix(results): supersede stale remote sync errors

[christso]

Summary

• Reconciles the remote-sync follow-up Beads (av-fis, av-fis.1, av-fis.2, av-fis.3, av-xqm) from the NTM-only graph into the AgentV branch graph.
• Implements av-xqm by deriving last_error from the current results-repo git inspection so stale persisted errors are cleared or superseded when status changes.
• Adds a regression that reproduces a dirty sync failure followed by a conflicted repo status and asserts the current conflict error replaces the older dirty-sync error.

Beads

• Implements: av-xqm
• Parent/reconciled follow-ups: av-fis, av-fis.1, av-fis.2, av-fis.3
• Backup before reconciliation: /tmp/agentv-beads-backups-20260609T054751Z

Red/Green Evidence

• Red: bun test packages/core/test/evaluation/results-repo.test.ts -t "supersedes stale sync errors" failed before the implementation with stale Results repo has uncommitted changes and auto_push is disabled while current status was conflicted.
• Green: the same focused regression passed after the implementation.

Verification

• bun test packages/core/test/evaluation/results-repo.test.ts passed 12/12.
• bun run build passed after bun install in the fresh worktree; existing Dashboard large-chunk warning only.
• bun test apps/cli/test/commands/results/serve.test.ts passed 83/83.
• bunx biome check packages/core/src/evaluation/results-repo.ts packages/core/test/evaluation/results-repo.test.ts passed.
• bun run test passed across core/eval/phoenix/cli/dashboard packages.
• Pre-push hook also passed typecheck and biome check ..

Migration Notes

• No config or wire-format migration required.
• API/status JSON still uses the existing last_error snake_case field; it now reflects the current inspected status instead of stale persisted sync errors.

Remaining Follow-ups

• av-fis.1: Dashboard stuck Syncing... UI state.
• av-fis.2: confirm/finish first-class CLI remote status/sync contract if current command surface is incomplete.
• av-fis.3: interrupted retry/cleanup coverage for git lock/rebase/rejected-push cases.

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