chore(master): release 3.4.0

[release-please]

🤖 I have created a release beep boop

3.4.0 (2026-04-09)

Features

• implement PKCE support in OAuth flows (#1142) (1a1665e)

Bug Fixes

• auth: remove hardcoded OAuth client secret from published npm package (CWE-798) (#1139) (a678e92)
• mcp: validate projectDir against permitted base paths (CWE-22 path traversal) (#1141) (1e8132c)
• prevent OAuth CSRF via missing state parameter in authorization flow (#1135) (8dac6c2)
• security: prevent path traversal via srcDir in .clasp.json (#1140) (408448e)
• security: validate sourceDir MCP parameter and use realpath in WriteFiles (#1144) (4eb9dca)

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