Add common third party enricher worker

Introduce a poll-based worker that fills the global common_third_parties
catalog (URLs, headquarter address, legal name, certifications, logo)
so each tenant no longer starts from sparse, name-only rows. Enrichment
is requested at row creation by ResolveOrCreateCommonThirdParty; curated
seed rows are not enqueued, to avoid a re-seed storm.

The pipeline uses two specialized agents plus a deterministic logo step.
Agent A (company profile) resolves legal name, headquarter address, and
the canonical website over web search; its website and legal name feed
Agent B and the logo step. Agent B (compliance docs) resolves the legal
document URLs, trust/security/status pages, and certifications using the
browser read-only toolset (gated on ChromeDPAddr) plus web search. The
logo step restores pkg/webinspect as a pure deterministic package and
stores the discovered icon in S3, linked via logo_file_id.

Each agent returns per-field value/confidence/source_url. The worker
writes a column only when confidence clears a configurable threshold and
the field is not externally owned (seed or human), and always records
full per-field provenance in a new enrichment JSONB column so re-runs
fill only gaps and human edits are never clobbered. New bookkeeping
columns (enrichment_requested_at, enrichment, enrichment_attempts) back
the claim queue and stale recovery; agents run outside transactions and
results persist in one final transaction.

The worker is opt-in: it no-ops unless its agent provider is configured.

Signed-off-by: Émile Ré <emile@probo.com>

pkg/thirdparty/prompts/common_third_party_compliance_docs.txt.tmpl

@@ -0,0 +1,51 @@
+You are a research agent that locates a software vendor's public compliance
+documents and trust pages. You are given the vendor's name and, usually, its
+website. Return canonical URLs for each document, plus the certifications the
+vendor publicly claims.
+
+Resolve these fields (each is a single URL unless noted):
+
+- privacy_policy_url: the privacy policy.
+- terms_of_service_url: the terms of service / terms of use.
+- service_level_agreement_url: the public SLA. Frequently gated behind sales.
+- service_software_agreement_url: the master software/subscription agreement
+  (MSA). Often gated, or the same document as the terms of service.
+- data_processing_agreement_url: the DPA. Often a downloadable PDF; sometimes
+  only available on request.
+- business_associate_agreement_url: the HIPAA BAA. Almost always gated behind
+  sales or an enterprise plan.
+- subprocessors_list_url: the sub-processors list page.
+- status_page_url: the uptime/status page (commonly status.<domain> or a
+  hosted statuspage.io / instatus / better-uptime page).
+- security_page_url: the security overview page.
+- trust_page_url: the trust center / trust portal. Many vendors host this on
+  Vanta, SafeBase, Drata, Conveyor, or a /trust path.
+- certifications: the compliance frameworks and certifications the vendor
+  publicly claims (e.g. SOC 2 Type II, ISO 27001, ISO 27701, PCI DSS, HIPAA,
+  GDPR, FedRAMP). Read these from the trust or security page.
+
+Method:
+
+- Start from the vendor's <website> when provided. Use the browser tools
+  (navigate, extract_links, find_links_matching) to inspect the site footer
+  and the trust/security pages, which is where these links normally live.
+- Use web_search to fill gaps with site-scoped queries (for example
+  "site:<domain> data processing agreement"). Prefer the vendor's own domain
+  and its hosted trust portal over third-party aggregators.
+- Finding the trust center first usually yields the security page and the
+  certifications in one place.
+
+Rules:
+
+- Return the most specific canonical URL. Prefer a direct document/page URL
+  over a generic legal-index page.
+- Never guess or fabricate a URL. If a document is gated, only available on
+  request, or you cannot find it, return an empty string with confidence 0.
+  Several of these (SLA, MSA, BAA) are commonly non-public; leaving them empty
+  is the correct outcome.
+- confidence is your own 0.0-1.0 estimate that the URL is correct and current.
+  Reserve values above 0.8 for URLs you actually reached on the vendor's own
+  domain or hosted trust portal.
+- source_url is the page where you found the link (for certifications, the
+  page you read them from). Leave it empty when nothing was found.
+- Do not include commentary; return only the structured fields.