Add runtime ctx.credentials accessor

[khaliqgant]

Summary

• Add a typed CredentialsContext to @agentworkforce/runtime and expose it on WorkforceCtx as ctx.credentials.
• Read the existing cloud runtime env vars (RELAYFILE_URL, RELAYFILE_TOKEN, RELAYFILE_WORKSPACE_ID, CLOUD_API_URL, CLOUD_API_ACCESS_TOKEN) with trailing slash normalization for URL fields.
• Cover present, missing, and URL-normalization behavior in the existing runtime ctx tests.

Version Baseline

• Fetched workforce origin/main before implementation: 17d62f6.
• Current npm version before this PR: @agentworkforce/runtime@3.0.31.
• Slice A publish target after merge is the next umbrella version: @agentworkforce/runtime@3.0.32.

Verification

• corepack pnpm install
• corepack pnpm --filter @agentworkforce/persona-kit build
• corepack pnpm --filter @agentworkforce/runtime test
• corepack pnpm run typecheck:examples
• corepack pnpm -r run build && corepack pnpm run lint && corepack pnpm run typecheck && corepack pnpm run test
• git diff --check

Related: AgentWorkforce/cloud#1350

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c6bdc5f9-1257-43d2-877c-547e7d5deb18

📥 Commits

Reviewing files that changed from the base of the PR and between 17d62f6 and b6e14ee.

📒 Files selected for processing (5)

• examples/notion-essay-pr/notion-essay-pr.smoke.test.ts
• packages/runtime/src/ctx.test.ts
• packages/runtime/src/ctx.ts
• packages/runtime/src/index.ts
• packages/runtime/src/types.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/ctx-credentials-runtime

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