fix(notify): capability-aware default MCP configure

[777genius]

This is the remaining R0/P0 follow-up for #177: truthful, capability-aware agent-notify configure. It does not add the UAP SDK, wizard, or portable asset.

Behavior

• Auto-default MCP is on only where this installer can actually configure it (macOS).
• On Linux/Windows, auto-default keeps hooks-only setup, prints unsupported_platform, and does not call that a full MCP installation. Bootstrap still exits 0 for that skip.
• Explicit --agent-notify without a supported OS or setup-notifications API is incomplete/nonzero. Committed hooks/plugin install are not rolled back.
• If the capability exists and configure fails, bootstrap/setup-codex/init.md return incomplete/nonzero with a retry command. Previously this was warning + exit 0.
• --skip-agent-notify remains hooks-only.

setup-codex now distinguishes auto vs explicit --agent-notify. Direct configure still owns the macOS-only setup contract; this PR only stops advertising a full MCP install when that contract cannot run.

Tests

• go test ./cmd/claude-notifications -run 'TestNotificationBootstrapOffline|TestNotificationInitOfflineBranch|TestNotificationConfigureParserAndSetupOptIn|TestSetupCodexE2E'
• bash -n bin/bootstrap.sh && bash bin/bootstrap_product_test.sh

  

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[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.06%. Comparing base (89d8524) to head (cd6c672).

Files with missing lines	Patch %	Lines
cmd/claude-notifications/setup_codex.go	25.00%	16 Missing and 2 partials ⚠️

Additional details and impacted files

@@                    Coverage Diff                    @@
##           feat/agent-notify-e2e     #185      +/-   ##
=========================================================
- Coverage                  65.27%   65.06%   -0.21%     
=========================================================
  Files                        168      168              
  Lines                      17182    17198      +16     
=========================================================
- Hits                       11215    11190      -25     
- Misses                      4360     4402      +42     
+ Partials                    1607     1606       -1     

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