fix: restore preview-specific package.json, lock, and changelog

[notgitika]

Summary

The main→preview sync (#1077) overwrote preview-specific files with main's versions:

• package.json: version changed from 1.0.0-preview.5 to 0.13.0
• package-lock.json: dependency versions reverted
• CHANGELOG.md: preview changelog entries lost

This restores all three to preview's versions from before the merge.

[agentcore-cli-automation]

Reviewed the diff and verified:

• The three files exactly match preview's pre-sync state (1277430) — clean revert ✅
• @aws/agent-inspector 0.2.1 is consistent with the browser-tests/tests/traces.test.ts already on preview. The sync at chore: sync main into preview — evo features #1077 bumped the package to 0.3.0 but kept preview's old version of the traces test (which uses trace-list / plain [role="button"] selectors rather than the 0.3.0 traces-trace-list / traces-span-tree / traces-log-panel testIds), so current preview HEAD is actually inconsistent — this PR brings those back into alignment.
• PACKAGE_VERSION (read from package.json in src/cli/constants.ts) has no snapshot or test assertions tied to a specific value, so rolling back to 1.0.0-preview.5 is safe.
• The CHANGELOG entries for the evo features etc. being removed is expected — those will be captured in the next preview.6 release entry via scripts/bump-version.ts, not duplicated from main's 0.13.0 section.
• package-lock only changes the version string and agent-inspector entry; no transitive dep drift.

LGTM to merge.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	43.43%	9860 / 22699
🔵	Statements	42.69%	10468 / 24518
🔵	Functions	40.45%	1665 / 4116
🔵	Branches	40.04%	6342 / 15838

Generated in workflow #2299 for commit b312ab2 by the Vitest Coverage Report Action