Release v4.6.9-beta.2

What's Changed

• fix(xai): preserve encrypted reasoning and cache reuse (92650c1f)
• fix(channels): allow OAuth model imports (a71f5aba)
• fix(proxy): align OAuth fallback and search tools (7885bee2)
• fix(xai): honor free usage cooldown (2cfc32f6)
• fix(web): correct clipboard and selection feedback (d7d3ff62)

Full Changelog: v4.6.9-beta.1...v4.6.9-beta.2