docs: update README and changelog for v2.6.0

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,18 @@ Format based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
 
+## [2.6.0] - 2026-03-12
+
+### Added
+- Proactive secret management — planning phase forecasts required API keys into a manifest; auto-mode collects pending secrets before dispatching the first slice
+- `--continue` / `-c` CLI flag to resume the most recent session
+
+### Fixed
+- Doctor post-hook no longer preempts `complete-slice` dispatch
+- `main_branch` preference restored; `runPreMergeCheck` implemented for merge safety
+- Recovery/retry prompt injection capped to prevent V8 OOM on large sessions
+- `.gsd/` excluded from pre-switch auto-commits to prevent squash merge conflicts
+
 ## [2.5.1] - 2026-03-12
 
 ### Added
@@ -243,7 +255,8 @@ Format based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ### Changed
 - License updated to MIT
 
-[Unreleased]: https://github.com/gsd-build/gsd-2/compare/v2.5.1...HEAD
+[Unreleased]: https://github.com/gsd-build/gsd-2/compare/v2.6.0...HEAD
+[2.6.0]: https://github.com/gsd-build/gsd-2/compare/v2.5.1...v2.6.0
 [2.5.1]: https://github.com/gsd-build/gsd-2/compare/v2.5.0...v2.5.1
 [2.5.0]: https://github.com/gsd-build/gsd-2/compare/v2.4.0...v2.5.0
 [2.4.0]: https://github.com/gsd-build/gsd-2/compare/v2.3.11...v2.4.0

README.md

@@ -224,6 +224,7 @@ On first run, GSD launches a branded setup wizard that walks you through LLM pro
 | `Ctrl+Alt+V` | Toggle voice transcription |
 | `Ctrl+Alt+B` | Show background shell processes |
 | `gsd config` | Re-run the setup wizard (LLM provider + tool keys) |
+| `gsd --continue` (`-c`) | Resume the most recent session for the current directory |
 
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