chore(agents): refresh WG slack-context digest

.agents/wg/slack-context.md

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+# WG Slack Context
+
+<!-- Generated by the wg-slack-context job. Do not edit by hand. -->
+
+**Background only.** Summarized from member-visible working-group Slack
+channels per `.agents/wg/constitution.md` §Information sources and the
+record: never quote or attribute this content in public output; Slack
+informs, GitHub decides.
+
+- Generated: 2026-07-19
+- Window: last 14 days
+- Channels: 20 public WG channels swept (4 private excluded)
+
+---
+
+# AAO AdCP Slack Digest — Week of 2026-07-07 through 2026-07-16
+
+---
+
+### VAST Validation Contract — Opt-In Levels & Error Codes
+
+- **Status:** active
+- **Summary:** A pull request proposes adding opt-in validation levels for VAST tags so that a structurally valid manifest cannot silently traffic a broken VAST tag. Sellers who do not inspect tags would be unaffected by the change. Feedback is being solicited on whether the proposed levels and associated error codes are correctly scoped.
+- **Related:** #5820
+- **Thread:** https://agenticads.slack.com/archives/C09C7PLE5B8/p1783520387371049
+
+---
+
+### `sync_creatives` Routing Clarification — Creative-Agent Role
+
+- **Status:** active
+- **Summary:** A documentation fix clarifies which agents actually receive `sync_creatives` messages: the trafficking-to-sales-agent path is the primary route, with the creative agent included only when it has opted into the library on-ramp. The change is described as a straightforward read with no structural impact.
+- **Related:** #5821
+- **Thread:** https://agenticads.slack.com/archives/C09C7PLE5B8/p1783520387371049
+
+---
+
+### Phantom Error Code Remapping
+
+- **Status:** active
+- **Summary:** A pull request remaps thirteen error codes that are documented but do not exist in the current schema, eliminating a known source of silent interoperability failures. Reviewers have been asked to assess the remapping within the next week.
+- **Related:** #5819
+- **Thread:** https://agenticads.slack.com/archives/C09C7PLE5B8/p1783520387371049
+
+---
+
+### Creative Formats v2 — Canonical Format Architecture for 3.x
+
+- **Status:** active
+- **Summary:** An open issue proposes the foundational direction for creative format authoring across the entire 3.x line, including canonical formats living on products, per-format tracking, and `validate_input` integration. The proposal carries v1 format deprecation through to version 5.0, making it the largest structural change on the creative roadmap. Early review is encouraged before the design is mid-flight.
+- **Related:** #3305
+- **Thread:** https://agenticads.slack.com/archives/C09C7PLE5B8/p1783520432418159
+
+---
+
+### Click Tracker Insertion — Chaining Semantics & Attribution Gap
+
+- **Status:** active
+- **Summary:** An open issue identifies that the macros page currently defines only a single `{CLICK_URL}` with no chaining semantics, leaving multi-party chaining, terminal-hop ownership, and the distinction between click count and click attribution underspecified. This is characterized as a real interoperability problem for buyers who need their click ID to survive to the landing page. A suggested framing to make the problem tractable was posted alongside the issue reference.
+- **Related:** #5693
+- **Thread:** https://agenticads.slack.com/archives/C09C7PLE5B8/p1783520432418159
+
+---
+
+### Sell-Side Governance Proposal — `sync_policies` Equivalence & Unified Agent Option
+
+- **Status:** active
+- **Summary:** A full sell-side governance proposal has been published for working-group review, addressing the structural asymmetry between buyer-operated campaign governance agents and the absence of a seller-side equivalent to `sync_plans`. The minimal base proposal mirrors the buyer pattern for sellers and introduces accepted governance agent declarations analogous to the `accepted_verifiers[]` pattern in creative governance. A stretch proposal explores consolidating governance into a single consensus-operated agent. The document was produced in response to community requests on the weekly governance calls.
+- **Thread:** https://agenticads.slack.com/archives/C09NUQS93DF/p1784198720767619
+
+---
+
+### Affiliate Channel / Revenue Share Pricing Gap
+
+- **Status:** parked
+- **Summary:** An issue covering the affiliate channel and revenue share pricing gap was raised prior to this period. No working-group discussion has occurred on the topic since it was filed, and the raising party has not yet participated in WG sessions.
+- **Related:** #5754
+- **Thread:** https://agenticads.slack.com/archives/C09NUQS93DF/p1783407539502479