fix(notify): wire Windows MCP configure onto navigation-none setup

[777genius]

Stacks on #187. After Windows production toast delivery and navigation-none installer, R0 auto/explicit --agent-notify must treat Windows as a supported MCP configure OS instead of skipping or erroring as unsupported_platform.

This does not fold Windows into #185 (macOS-only capability gate on #177) or into the Linux configure child of #186.

What changed

• Cherry-picks the R0 capability-aware configure contract onto Windows P7.
• agent_notify_platform_supported / agentNotifySetupSupported() accept Darwin or Windows (Git Bash mingw*/msys*/cygwin*).
• Auto-default bootstrap and /init now call configure on Windows (navigation=none via the existing default route).
• Explicit --agent-notify on Windows is a real configure attempt, not an unsupported-OS failure.
• Unsupported OS (Linux on this stack) still skips on auto-default (exit 0) and fails explicit request (exit 1).
• Includes the Windows P7 runner fixes: journal owner/DACL, anonymous-pipe stdio, directory Sync no-op (FlushFileBuffers does not support directory handles), NtCreateFile FILE_GENERIC_* rights (not unmapped GENERIC_WRITE), IdentityMode(0600) private policy, and portable locator filesystem.
• Existing-installer MCP command is the generated claude-notifications.bat launcher, not the Unix bin/claude-notifications name that does not exist on Windows.
• TestSetupCodexE2EConfigureNotifications now stages a small platform-named writer instead of the 32 MiB Windows CLI, so the test can run on Windows runners.
• TestNotificationBootstrapWindowsGitBashUname stubs uname as MINGW64_NT so Linux CI proves Git Bash platform detection.
• Skill ownership still records POSIX 0600. Inspect/CAS compare that record to the host-retained IdentityMode so Windows enable revalidate does not treat a just-projected skill as registration_conflict.

Tests

• go test ./internal/agentnotify/clientsetup ./internal/agentnotify/setup ./cmd/claude-notifications -count=1
• TestSkillIdentitiesEqualHostMode and Windows-only TestWindowsSkillInspectAfterApply cover the fingerprint mismatch that failed TestSetupCodexE2EConfigureNotifications on GH Windows 1.26.

  

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[codecov]

Codecov Report

❌ Patch coverage is 46.51163% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.06%. Comparing base (05d0c6d) to head (c4d4d6f).

Files with missing lines	Patch %	Lines
cmd/claude-notifications/setup_codex.go	25.00%	16 Missing and 2 partials ⚠️
internal/agentnotify/clientsetup/skill.go	76.92%	1 Missing and 2 partials ⚠️
cmd/claude-notifications/notification_configure.go	66.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@                             Coverage Diff                              @@
##           cursor/uap-installer-windows-notify-6c84     #189      +/-   ##
============================================================================
- Coverage                                     65.25%   65.06%   -0.20%     
============================================================================
  Files                                           172      172              
  Lines                                         17287    17316      +29     
============================================================================
- Hits                                          11281    11267      -14     
- Misses                                         4383     4427      +44     
+ Partials                                       1623     1622       -1     

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