Release v0.2.6

What's Changed

• feat: 0.2.6 pre-release — metrics always-on, smart routing fixes by @dzhsurf in #90
• fix(test): align native SQLite tests with CI by @dzhsurf in #91
• fix: strip Claude billing header to preserve prompt caching by @dzhsurf in #92
• feat: log request/response headers with sensitive-value masking by @dzhsurf in #93
• fix: concurrency hot-reload, Settings save feedback, and split log/metrics clearing by @dzhsurf in #94
• chore: release 0.2.6 by @dzhsurf in #95

Full Changelog: v0.2.5...v0.2.6