chore(main): release 0.3.5

[release-please]

🤖 I have created a release beep boop

0.3.5 (2026-08-14)

Features

• groups: Add ttlMs and cacheScope customization to config (mcp-toolbox#​3805) (a5d4947) (08cb038)
• migrate: Convert toolset to group kind during migration (mcp-toolbox#​3704) (0adeaa5) (08cb038)
• server/mcp: Introduce generic client extension registry (mcp-toolbox#​3723) (016245c) (08cb038)
• skill: Add review-prs skill for mcp-toolbox (mcp-toolbox#​3743) (5b7bacc) (08cb038)
• sources/spanner: Rename execute_sql_dql to execute_sql_readonly (mcp-toolbox#​3776) (cf5a0c8) (08cb038)
• tools: Add cloud-sql-connect-gce for pg, mysql, mssql (mcp-toolbox#​3740) (ca58fa4) (08cb038)

Bug Fixes

• auth/mcp: Derive PRM URL from Toolbox URL (mcp-toolbox#​3765) (aa30842) (08cb038)
• config: Ignore environment variables in YAML comments (mcp-toolbox#​3807) (79aa732), refs mcp-toolbox#​3793 (08cb038)
• mcp: Return Tool execution error for invalid input param (mcp-toolbox#​3799) (8120197) (08cb038)
• prebuilt/cloud-storage: Declare tool collections as groups (mcp-toolbox#​3764) (7d468be) (08cb038)
• server: Avoid a nil-flusher panic in the SSE handler (mcp-toolbox#​3520) (947f42f) (08cb038)
• server/mcp: Disallow client overriding URL bound parameters (mcp-toolbox#​3798) (f15a9c7) (08cb038)
• util: Convert exponent-form JSON numbers in ConvertNumbers (mcp-toolbox#​3730) (e9713ee) (08cb038)

---

This PR was generated with Release Please. See documentation.

[release-please]

🤖 Created releases:

• 0.3.5

🌻