chore: add prepack and publishConfig to all workspace packages

[isamu]

Summary

• Adds "prepack": "yarn build" to every workspace package's scripts so that npm publish / yarn pack always regenerates lib/ before the tarball is assembled.
• Adds top-level "publishConfig": { "access": "public" } to every workspace package so npm publish --access public is no longer required at the CLI for scoped packages.
• Keeps lib/ as the build output (no migration to dist/).
• Affects 33 package.json files across packages/, agents/, agent_filters/, and llm_agents/.
• Adds plans/chore-prepack-publishconfig.md per the repo's bug-fix / feature-request workflow.

Items to Confirm / Review

1. prepack semantics — the hook runs on both npm pack and npm publish, and also on yarn pack (verified locally with yarn pack --dry-run in packages/graphai). If the release process currently assumes a pre-built lib/, this change no-ops; if it assumed no build, the extra build is the intended fix.
2. No private: true packages — every workspace package was treated as publishable. None were marked private, including packages/samples and llm_agents/playground whose build scripts are echo nothing. For those, prepack effectively does nothing, which is harmless.
3. Non-scoped graphai package — publishConfig.access: "public" is valid but technically redundant for the unscoped graphai package. Left in for uniformity; can be removed if preferred.
4. Release docs in CLAUDE.md — npm publish --access public still works; --access public is now redundant but not harmful. Docs not updated in this PR — flag if you'd like that follow-up.

User Prompt

npm の publish 時の設定、prepack で yarn build → lib/ 生成 → publishConfig で lib/ が参照される流れです。これを全てのパッケージで追加できる？

（当初は dist/ と書いてあったがコピペミスで、正しくは lib/）

B案（lib/ のまま、prepack と publishConfig だけ追加する最小変更）で、ブランチを作って進めて。PRも作ってほしい。

Implementation

Per-file change (all 33 package.json files):

   "scripts": {
     …existing scripts…,
+    "prepack": "yarn build"
   },
   …
+  "publishConfig": {
+    "access": "public"
+  }

Applied mechanically via a one-shot Node script that parsed/serialized each package.json preserving existing key order (script deleted before commit).

Validation

• yarn format — clean
• yarn build — all 33 packages built successfully
• yarn pack --dry-run in packages/graphai — confirms prepack → yarn build runs before tarball creation
• yarn eslint — one pre-existing error in the untracked file packages/agentdoc/tests/schema2doc.ts; unrelated to this PR (reproduces on main)

Test plan

• CI passes on this PR
• On next package release, confirm npm publish (or yarn npm publish) triggers yarn build automatically via prepack
• Confirm publishConfig.access is honored by the registry (no --access public needed)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 22456dec-5e26-4c3c-bdec-2f3fa2d31fd3

📥 Commits

Reviewing files that changed from the base of the PR and between e181366 and bfed3cc.

📒 Files selected for processing (34)

• agent_filters/cache_agent_filter/package.json
• agent_filters/http_client_agent_filter/package.json
• agent_filters/namedinput_validator_agent_filter/package.json
• agent_filters/step_runner_agent_filter/package.json
• agent_filters/stream_agent_filter/package.json
• agent_filters/utils/package.json
• agents/agent_utils/package.json
• agents/data_agents/package.json
• agents/input_agents/package.json
• agents/llm_agents/package.json
• agents/service_agents/package.json
• agents/sleeper_agents/package.json
• agents/vanilla_agents/package.json
• agents/vanilla_node_agents/package.json
• llm_agents/anthropic_agent/package.json
• llm_agents/gemini_agent/package.json
• llm_agents/groq_agent/package.json
• llm_agents/llm_utils/package.json
• llm_agents/openai_agent/package.json
• llm_agents/openai_fetch_agent/package.json
• llm_agents/playground/package.json
• llm_agents/replicate_agent/package.json
• llm_agents/slashgpt_agent/package.json
• llm_agents/token_bound_string_agent/package.json
• llm_agents/tools_agent/package.json
• packages/agent_filters/package.json
• packages/agentdoc/package.json
• packages/agents/package.json
• packages/cli/package.json
• packages/graphai/package.json
• packages/lite/package.json
• packages/samples/package.json
• packages/test_utils/package.json
• plans/chore-prepack-publishconfig.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-prepack-publishconfig

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