fix(sdk-vue,sdk-svelte,sdk-solid): import agent API from @wraith-protocol/sdk-agent

[Classictowo]

Summary

On develop, importing @wraith-protocol/sdk-vue, @wraith-protocol/sdk-svelte or @wraith-protocol/sdk-solid from Node throws before any code runs:

SyntaxError: The requested module '@wraith-protocol/sdk' does not provide an export named 'Chain'

#193 moved Wraith, WraithAgent and Chain from @wraith-protocol/sdk to @wraith-protocol/sdk-agent, but these three companions still imported them from the core. React and agent were unaffected.

Closes #249

Changes

• Imports - packages/sdk-vue/src/composables/useWraith.ts, packages/sdk-svelte/src/primitives/useWraith.ts and packages/sdk-solid/src/primitives/createActivity.ts now import Wraith, WraithAgent, Chain and the agent types from @wraith-protocol/sdk-agent.
• Dependencies - added @wraith-protocol/sdk-agent: workspace:* to each companion's dependencies (lockfile updated).
• Build - added @wraith-protocol/sdk-agent to each companion's tsup external list, and the root pnpm build now also builds @wraith-protocol/sdk-agent. The companions' unit tests and the SSR import check load that package's built dist/, so it must exist after pnpm build (the SSR script itself documents "run pnpm build first").
• Tests - pointed the useWraith / createActivity mocks at @wraith-protocol/sdk-agent.
• SSR smoke test - removed the three companions from KNOWN_IMPORT_FAILURES in scripts/compat/verify-ssr-imports.mjs; they import cleanly now, so the check fails until the entries are removed (as its comment describes).

Verification

• pnpm build produces dist/ for the core and packages/sdk-agent/dist/.
• node scripts/compat/verify-ssr-imports.mjs - every companion imports and renders server-side:

ok   ssr import @wraith-protocol/sdk-agent
ok   ssr render @wraith-protocol/sdk-agent (agent)
ok   ssr import @wraith-protocol/sdk-react
ok   ssr render @wraith-protocol/sdk-react (react)
ok   ssr import @wraith-protocol/sdk-solid
ok   ssr render @wraith-protocol/sdk-solid (solid)
ok   ssr import @wraith-protocol/sdk-svelte
ok   ssr render @wraith-protocol/sdk-svelte (svelte)
ok   ssr import @wraith-protocol/sdk-vue
ok   ssr render @wraith-protocol/sdk-vue (vue)

• Node import repro (built dist), ESM and CJS, all three companions:

vue ESM ok: function   svelte ESM ok: function   solid ESM ok: function
vue CJS ok: function   solid CJS ok: function

• pnpm test:types passes; packages/sdk-vue/test/useWraith.test.ts (5 tests) and packages/sdk-solid/test/createActivity.test.ts (13 tests) pass; pnpm --filter @wraith-protocol/sdk-svelte test (10 tests) passes.
• pnpm test:compat reaches the SSR step green; the only local failure on this Windows runner is verify-package.mjs's EPERM symlink step, which is unrelated to this change and passes on Linux CI.

Notes

• COMPAT.md reports "stale" on a Windows checkout purely because of CRLF line endings; node scripts/compat/check.mjs --write produces a zero-byte diff against the committed file, so it is left untouched.

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[truthixify]

The companion-package import correction looks right, but the required test jobs fail at the formatting gate. Prettier reports changes in packages/sdk-solid/src/primitives/createActivity.ts and packages/sdk-svelte/src/primitives/useWraith.ts. Please format those files and rerun CI.