* Site audit P0 (1/3): issue engine, incremental persistence, block detection
Server-side foundation of the P0 feature set from docs/site-audit-pm-research.md:
- Issue engine: shared registry of issue types (severity, explanation,
how-to-fix). Per-page reporters run inside crawl steps; cross-page checks
(duplicate titles/descriptions/content, broken internal links, redirect
chains/loops, orphan pages) run at finalize as SQL over the persisted crawl.
- New audit_links + audit_issues tables, audit_pages columns (depth, content
hash, header signals, fetch class, sitemap flag); audit tables moved to
src/db/{,pg/}audit.schema.ts; migrations 0029 (D1) / 0006 (PG).
- Incremental persistence: pages/links/issues written inside each crawl-batch
step with deterministic row ids + upserts (retry idempotent); slim step
state; robots.txt checkpointed as step state; merged progress steps keep a
10k-page crawl within the Workflows step budget.
- Crawler: manual redirect handling with inline follow of normalization-
equivalent redirects, response header capture (X-Robots-Tag, Link
rel=canonical), BFS depth, sitemap-last seeding, SSRF check on discovered
links, honest 'we were blocked' classification (403/429/cf-mitigated/
challenge).
- MCP: run_site_audit, get_audit_status, get_audit_issues, get_audit_pages;
limitTier resolved via shared AuditService.resolveAuditLimitTier.
- Lighthouse strategies reduced to auto/none (legacy all/manual map on read).
- Self-healing: getStatus reconciles audits whose workflow instance errored/
terminated without reaching mark-failed.
The Issues UI and the badseo.dev e2e fixture site stack on top of this PR.
Deploy notes: run db:migrate:prod (additive); terminate running audits before
deploying — the workflow step structure changed and in-flight instances cannot
replay under the new code (a finalize guard fails them loudly instead of
completing empty).
* Store only internal link edges in audit_links
Both consumers (broken-internal-link and orphan checks) filter on
isInternal; per-page external counts already live on audit_pages.
Dropping external rows cuts stored edges on outbound-heavy sites.
Column stays so P1 external-link checks can re-add rows without a
migration.
* Review fixes: failAudit CAS guard, dedupe hash helpers, cheaper checks
- failAudit only transitions running audits, so the getStatus reconciler
can't flip a just-completed audit to failed when it races finalize
- collapse the duplicate SHA-256 helper into audit/ids.ts
- finalize integrity guard uses a limit-1 existence probe instead of
fetching every page row
- get_audit_status MCP tool no longer reads the audit row twice when an
explicit auditId is given
Ben Senescu