[test-generator] Cover analytics reporter guardrails

[r3dbars]

Summary

• Add focused fast coverage for AnalyticsReporter.countBucket, queueDepthBucket, durationBucket, and wordCountBucket, which back bucketed dictation, meeting, onboarding, runtime, and reliability telemetry.
• Add related guardrail coverage for AnalyticsReporter.defaultProperties, so missing build metadata and sanitized session IDs stay stable before analytics capture.

Missing coverage

Recent analytics work added and expanded bucketed observability payloads, but the shared reporter helpers had gaps in direct fast coverage. Prior commits on this branch covered bucket boundaries. This update stays in the same AnalyticsReporter seam and covers default metadata behavior that could silently drift into missing app/build fields or unsafe session metadata.

Tests added

• AnalyticsReporter default properties fall back when build metadata is unavailable
• AnalyticsReporter default properties trim session identifiers
• AnalyticsReporter default properties omit blank session identifiers
• AnalyticsReporter default properties cap long session identifiers
• Existing branch coverage also includes direct boundary and guardrail tests for countBucket, queueDepthBucket, durationBucket, and wordCountBucket.

Verification

• bash scripts/dev/agent-preflight.sh
• bash run-tests.sh (3072 passed)
• bash build.sh --no-open
• Prior branch verification also ran bash build-deps.sh --force before the original build when stale deps were detected.

[r3dbars]

verdict: no-findings-but-human

Reviewed head 020d409c021ae09a931e71ba3b0d966d72bebb1c. Findings: none.

Actions: human signoff because this is a draft PR and touches analytics telemetry bucket coverage. No fix pushed.

Checks: reviewed PR metadata, discussion, diff, and status checks; repo-hygiene is passing; read repo/test/Observability guidance; ran git diff --check origin/main...origin/codex/test-generator-2026-05-31-count-bucket.

manual_merge_handoff:
head_sha: 020d409
verdict: no-findings-but-human
blockers: draft PR and analytics telemetry human signoff
checks: gh pr view/diff/checks, repo-hygiene passing, local docs reviewed, git diff --check