Summary

Follow-up to #120. The weekly search report previously only emitted to Slack on failure (#oss-alerts). A successful report is valuable signal, so on a successful Notion publish it now posts a digest to #engr:

📊 Pathfinder weekly search report — 2551 tool calls · 198 unique IPs · top: Agents/CoAgents/AG-UI · 3.3% empty · [report] (where [report] is a Slack mrkdwn link to the Notion page).

• New SLACK_ENGR_WEBHOOK env (workflow secret SLACK_WEBHOOK_ENGR, a B0T #engr incoming webhook — same convention as SLACK_WEBHOOK_OSS_ALERTS/SLACK_WEBHOOK_TEAM_SHOWCASE).
• Failures unchanged — still fail-loud to #oss-alerts via SLACK_WEBHOOK.
• Best-effort success ping: no-ops when the webhook is unset (so this is safe to merge before the secret exists) and never affects the run's exit code.

Test plan

• Red-green: success run posts the digest (incl. <url|report>) to the success poster and NOT the failure poster; fetch/token failure posts to the failure poster and NOT the success poster; unset success webhook no-ops. (52 report tests; full suite 6522 green)
• tsc (root + scripts), npm run build, prettier --check, actionlint clean
• After merge: create the B0T #engr incoming webhook → set org secret SLACK_WEBHOOK_ENGR; next Sunday run (or a workflow_dispatch) posts to #engr

7-agent CR converged on round 1 (zero in-subject findings); pre-existing report-rendering follow-ups (table backslash-escape, categorization useCoAgent keyword, parseReportDays cap, etc.) tracked from #120, not in scope here.

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