ci: bump Go test timeout 15m -> 20m (server + ingestor)

[efiten]

Problem

The server Go suite runs ~13–15m against a 15m go test -timeout, so on slower CI runners it intermittently hits panic: test timed out after 15m0s (cmd/server, e.g. db_test.go) — false-red CI that a plain rerun clears. Observed on PR #1728 (15m25s on the passing attempt — right at the ceiling).

Fix

Bump both go test invocations (cmd/server and cmd/ingestor) from -timeout 15m to -timeout 20m for headroom. No test or application code changes — CI workflow only.

Verification

Workflow-only change; this PR's own CI is the confirmation.

🤖 Generated with Claude Code

[Kpa-clawbot]

🤖 Hourly PR-watch review

Verdict: APPROVE — trivial CI timeout bump

Diff is two characters: -timeout 15m → -timeout 20m on the server + ingestor go test invocations in .github/workflows/deploy.yml. CI is green on this branch with the new timeout, which is the only assertion that matters for a workflow-config change.

TDD exemption

Pure config change. AGENTS.md TDD-exempt rule applies: "existing tests MUST stay green AND unaltered" + "no test files modified" + "CI green without test edits." All three hold (CI green ✅, no test files in diff ✅).

Findings: 0 BLOCKER / 0 MAJOR / 1 NIT

• NIT: PR body would benefit from a one-liner about why 15m was insufficient (slowest job duration or specific test that drifted near the cap), so the next operator knows whether 20m is enough headroom or just kicking the can.

3-axis merge gate

• ✅ mergeable: MERGEABLE
• ✅ mergeStateStatus: CLEAN
• ✅ All CI: SUCCESS

Auto-merging.

Reviewed by: orchestrator self-review (CI config, no code surface).