chore(deps): bump AdCP to 3.0.6 + close end-to-end gaps for guaranteed worked example

[bokelley]

Summary

Bumps the SDK's pinned ADCP_VERSION from 3.0.5 to 3.0.6 and runs the hello_seller_adapter_guaranteed storyboard suite unfiltered, end-to-end, for the first time. Surfacing 3.0.6 turned up three latent SDK gaps; this PR closes them.

Spec sync

3.0.6 ships our two upstream fixture PRs:

• adcontextprotocol/adcp#3989 — media_buy_seller/inventory_list_targeting adds sandbox: true on every account block. Closes SDK: opinionated MediaBuyStore + auto-echo for targeting_overlay #1415 from the fixture side; SDK side shipped via createMediaBuyStore auto-echo (PR feat(server): createMediaBuyStore — opt-in targeting_overlay echo (#1415) #1424).
• adcontextprotocol/adcp#3990 — sales_guaranteed/create_media_buy uses task_completion.media_buy_id for context_outputs.path. Closes Storyboard runner: can't capture context_outputs.path from HITL task completion artifact #1417 from the fixture side; SDK side shipped via runner's task_completion.<path> prefix (PR feat(runner): task_completion. path prefix on context_outputs (#1417) #1426).

#1416 (NOT_CANCELLABLE) closed earlier in Phase 4 (assertMediaBuyTransition wired into the guaranteed adapter).

SDK fixes for the round-trip

1. tasks_get registered only under the underscore name. Buyer-side TaskExecutor.getTaskStatus calls the spec's slash form tasks/get via ProtocolClient.callTool. Framework now registers under both tasks/get (spec) and tasks_get (legacy alias). Fixes the 30s tasks/get poll timed out failure on every HITL flow.
2. tasks_get input schema only accepted {account_id} and rejected the natural-key {brand, operator, sandbox} arm — same shape gap Phase 2 fixed for comply_test_controller. Now matches the full canonical AccountReference.
3. AgentClient didn't expose executor. The storyboard runner's pollTaskCompletion accesses client.executor; on AgentClient (the public client returned by multiClient.agent(id)) it was undefined, so canPoll was always false and the runner fell back to webhook-only racing — which times out for fixtures whose push_notification_config.url doesn't address a runner-controlled webhook. Added an @internal executor getter that proxies to the wrapped SingleAgentClient.

Hello seller-guaranteed adapter (worked example)

• accounts.resolve(undefined, ctx) auth-derived fallback so the framework's tenant boundary on tasks/get resolves a tenant from ctx.authInfo alone. Returns the production singleton (matching the account that owned the original task).
• taskRegistry hoisted out of the serve() factory so HITL tasks survive across requests.
• createMediaBuy HITL bypass yields to the buyer's push_notification_config. Sandbox-mode + push-config goes through HITL (matching sales_guaranteed's narrative); sandbox-mode without push-config still bypasses for cascade scenarios.
• getMediaBuyDelivery.by_package[] now includes pricing_model, rate, currency per AdCP 3.0.6's tightened required fields.

Allowlists

• hello-seller-adapter-guaranteed.test.js — EXPECTED_FAILURES = []. Storyboard passes unfiltered against 3.0.6.
• hello-seller-adapter-non-guaranteed.test.js — #1415 dropped (3.0.6 closes it). #1416 retained: the SDK helper exists, the non-guaranteed worked example hasn't been migrated to assertMediaBuyTransition yet — follow-up.

Test plan

• npm run build clean
• npm run test:lib — 6022/6022 pass
• All 7 test/examples/hello-*.test.js files green
• Live storyboard run against the boots — 30/30 scenarios pass for sales_guaranteed, no allowlist filter
• npm run format:check clean

Refs

• adcp-client#1415, SDK: export MEDIA_BUY_TRANSITIONS + assertMediaBuyTransition for runtime use #1416, Storyboard runner: can't capture context_outputs.path from HITL task completion artifact #1417 — closed end-to-end (SDK + fixtures)
• fix(compliance): inventory_list_targeting — add sandbox:true to account fixtures adcp#3989, #3990 — fixture PRs
• adcp-client#1424 (createMediaBuyStore), feat(runner): task_completion. path prefix on context_outputs (#1417) #1426 (task_completion. prefix), feat(server): export MEDIA_BUY_TRANSITIONS + assertMediaBuyTransition (#1416) #1427 (assertMediaBuyTransition), feat(examples): hello-seller-guaranteed enforces MediaBuy state machine (#1416) #1480 (Phase 4)

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