fix: preserve capability portfolio routing fields

[bokelley]

Summary

• normalize media_buy.portfolio.primary_channels into AdcpCapabilities.channels
• expose primary_countries as the optional AdcpCapabilities.countries field
• retain the previous nonstandard portfolio.channels behavior as a compatibility fallback, with canonical precedence
• add a patch changeset for the published SDK

Root cause

The capability parser read a nonexistent portfolio.channels field and did not project portfolio.primary_countries, so spec-compliant sales-agent portfolio routing data was only available through _raw.

Validation

• three independent expert reviews (parser/API, compatibility, test/release)
• npm run typecheck
• npm run build
• node --test test/lib/v3-compatibility.test.js (181 passing)
• Prettier and git diff --check

Closes #2435

[aao-secretariat]

Ladon verdict: Approve

Approve — small, correct witness-not-translator fix.

What I checked:

• parseCapabilitiesResponse now reads spec portfolio fields primary_channels (with legacy portfolio.channels fallback) and adds primary_countries, matching the get-adcp-capabilities schema (core.generated.ts:23072-23095). This corrects prior code that read the nonstandard portfolio.channels, which produced undefined channels downstream.
• Witness-not-translator respected: _raw preserved, spec field surfaced, legacy read retained rather than fabricated — no re-shaping or invented fields.
• Tests cover both primary-wins and legacy-fallback paths.
• Changeset present (.changeset/fix-capability-portfolio-fields.md) covering the src/lib/** change.

Medium findings: none.

Note (low, non-blocking): The reviewer flagged that the new public field countries on AdcpCapabilities ships under a patch changeset. This is a low finding (additive new field, not a removed/renamed export or shape break), so it does not meet the high changeset-understatement bar and does not block.

Decision table: no critical/high findings (row 1 n/a); gated_paths false (row 2 n/a); high_risk false (rows 3, 5 n/a); no medium findings (rows 4, 8 n/a); no author-team gate (row 7 n/a); no prior decision (row 6 n/a). Falls through to row 9 → approve. Note review_decision is REVIEW_REQUIRED, but gated_paths is false, so the row-2 gate does not apply.

[aao-secretariat]

Ladon verdict: Approve

Approve — additive/descriptive delta since prior approve, no blocking findings.

What I checked:

• New optional HTTPS-gated sample_render_url field on the catalog-format schema (schemas/registry/registry.yaml) — additive, no wire-shape breakage.
• OR-to-AND semantic refinements to metric_id/accreditation query-param descriptions in the vendored registry OpenAPI mirror — descriptive only.
• src/lib/registry/types.generated.ts regeneration is JSDoc-only (no signature change).
• Changeset present (.changeset/fix-capability-portfolio-fields.md) — satisfies changeset-vs-wire-impact rule.
• No load-bearing SDK code path moved; no fabrication/re-shaping (witness-not-translator preserved).

Findings: none.

High-risk note: high_risk: true fires only because schemas/registry/registry.yaml (modified) matches schemas/registry/**. Per the decision rules, a modified high-risk file with no medium-or-higher finding is presumed safe — not an escalation trigger. gated_paths: false, no no-auto-approve team match. Rows 1–8 do not fire; falls through to row 9 = approve.