Release: bump cua-ai 0.3.1, cua-agent 0.3.4, cua-cli 0.1.3 (playwright_execute)

[rgarcia]

Summary

Version bumps to release the playwright_execute feature (#33). That feature
spans all three packages, and none are currently published with it — the live
versions (cua-ai@0.3.0, cua-agent@0.3.3, cua-cli@0.1.2) all predate the
#33 merge. So a CLI-only release won't work: cua-cli pins exact versions of
cua-ai/cua-agent whose published builds have no playwright code.

package	version	dep bumps
cua-ai	0.3.0 → 0.3.1	—
cua-agent	0.3.3 → 0.3.4	cua-ai → 0.3.1
cua-cli	0.1.2 → 0.1.3	cua-ai → 0.3.1, cua-agent → 0.3.4

Plus CHANGELOG entries for cua-ai/cua-agent and a regenerated lockfile
(which also picks up a pre-existing stale cua-cli lock entry, 0.1.1 → 0.1.3).

Bump size: patch. The tool is a new additive feature with new public
exports, so minor bumps would be more semver-correct — easy to switch if
preferred before merge.

Release procedure (after this merges)

Push tags in dependency order, waiting for each npm publish before the
next (the agent/cli release workflows verify their deps are already on npm):

1. cua-ai/v0.3.1
2. cua-agent/v0.3.4
3. cua-cli/v0.1.3

Test plan

• npm run typecheck (workspace) passes
• lockfile regenerated via npm install; diff limited to the three version + dep refs
• release workflows publish in order once tags are pushed

---

Note

Low Risk
Release-metadata only (versions, changelogs, lockfile); no application logic changes in the diff.

Overview
This PR does not add new runtime code; it ships the playwright_execute work from #33 by bumping package versions and documenting what those releases contain.

@onkernel/cua-ai 0.3.0 → 0.3.1 — CHANGELOG notes the public playwright_execute tool surface (CuaPlaywrightSchema, createCuaPlaywrightToolDefinition(), related constants/types).

@onkernel/cua-agent 0.3.3 → 0.3.4 — bumps its cua-ai dependency to 0.3.1 and documents the opt-in playwright option on CuaAgent / CuaAgentHarness (Kernel SDK Playwright/TypeScript against the live session, failures as tool content) plus PlaywrightDetails.

@onkernel/cua-cli 0.1.2 → 0.1.3 — pins cua-ai@0.3.1 and cua-agent@0.3.4 so the CLI tarball matches published agent/ai builds that include playwright.

package-lock.json is regenerated so workspace refs align (including a stale cua-cli lock entry corrected to 0.1.3).

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