fix: harden wizard input validation and make generation atomic

[aoreshkov]

Summary

Fixes from a review pass. User-facing changes are in CHANGELOG.md under ## Unreleased → Fixed:

• Keyword validation: Kotlin and Java keywords are rejected as package segments and as feature or field names. The package proposed from the project name is always valid, for example for projects named "Object", "Class" or "2FA".
• Android Studio name handling: feature and field names are normalized (My Feature → my_feature). A name that can't become an identifier stops generation with a notification that names the field, instead of reporting success.
• Test value escaping: quotes, backslashes and $ in the test value are escaped in the generated tests.
• Package name trimming: stray spaces in the package name are removed.
• Rollback on failure: a failed generation removes every file it wrote and restores every file it replaced. In Android Studio, the default project files are replaced only after rendering succeeds.
• Single apiDump: the post-sync apiDump runs at most once, even when two sync events arrive together.

Internal:

• generateTemplates now also writes RENAMES.txt (the forward dotfile rename table), and a test asserts that RESTORED_FILE_NAMES reverses every entry.
• KMPLicense.isLicensed() delegates to an injectable licenseState(...) so its tri-state mapping can be unit-tested. A new expired-license .p12 test fixture was added.

Test plan

• ./gradlew test: new and updated tests for validation, staged generation and rollback, Studio scaffold, license state, substitution and rename symmetry, and apiDump listener once-only behavior
• ./gradlew verifyPlugin: Compatible with IU-261/262/263 and Android Studio 261/262

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