Add AgentAd ad schemas as a LogicSRC primitive (#10)

* Add AgentAd ad schemas as a LogicSRC primitive

AgentAd is a disclosed, agent-readable advertising contract for CLI tools
and AI agents. LogicSRC owns the canonical schemas; cl1s.tech is the
reference network built on them.

- packages/schemas: agentad-{ad,placement,ad-request,ad-response,
  impression,click,campaign} schemas (id under schemas.logicsrc.com) +
  ad/placement fixtures, exported from @logicsrc/schemas
- packages/validators: register the 7 agentad kinds, wire fixture
  validation, add tests (disclosure.sponsored must be true)
- docs/agentad.md: the AgentAd spec
- README: list AgentAd under v1 priorities

Validators build clean; all fixtures validate; vitest 4/4 green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* Prepare @logicsrc/schemas for npm publish

Add license, repository, homepage, keywords, publishConfig (public),
and a package README covering both the logicsrc-* core schemas and the
agentad-* family.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

packages/schemas/fixtures/agentad-ad.yaml

@@ -0,0 +1,33 @@
+type: agentad.ad
+version: "0.1"
+id: deploy-faster-railway
+campaign_id: railway-q3
+advertiser_did: railway.coinpay
+format: markdown
+title: Ship your CLI to production in 60 seconds
+body: Railway deploys any Node, Bun, or Go service straight from your terminal. No YAML wrangling.
+url: https://railway.app/?ref=cl1s
+cta: Deploy now
+disclosure:
+  sponsored: true
+  label: Sponsored
+  advertiser_name: Railway
+machine_readable:
+  product: railway
+  category: infrastructure
+  install: "npm i -g @railway/cli"
+targeting:
+  surfaces:
+    - cli
+    - agent
+  keywords:
+    - deploy
+    - hosting
+    - infrastructure
+  tools:
+    - claude-code
+    - gh
+pricing:
+  model: cpc
+  bid: 0.4
+  currency: USDC