Agents: enable permissions for agents to perform normal work in the repository

[Jason Morse (JasonVMo)]

Platforms Impacted

• Permissions only, impacts agent sessions on all platforms

Description of changes

This sets up agent permissions that allow making fixes in the repository. It blocks destructive git operations or pushing changes upstream but is set up to allow local workflows that are working within repo scope.

[github-actions]

Bundle size report

Tree-shaken production Metro bundles. Component costs are relative to their platform shell; shell costs are absolute.

Platform	Scenario	Baseline cost	Current cost	Cost delta	Change	Gzip delta	Module delta
macos	shell	801.3 KiB	801.3 KiB	0.0 KiB	0.00%	0.0 KiB	+0
macos	components-button	50.1 KiB	57.4 KiB	+7.3 KiB	+14.58%	+2.3 KiB	+17
macos	components-catalog	267.3 KiB	281.6 KiB	+14.3 KiB	+5.35%	+5.1 KiB	+24
macos	design-theme-state	33.3 KiB	33.7 KiB	+0.4 KiB	+1.34%	+0.2 KiB	+6
macos	design-themed-root	New	36.1 KiB	New	New	New	New
macos	design-color-lib	7.1 KiB	7.1 KiB	0.0 KiB	0.00%	0.0 KiB	+0
macos	design-theme-state-legacy-source	35.3 KiB	35.8 KiB	+0.4 KiB	+1.26%	+0.1 KiB	+6
macos	design-legacy-theme-from-flex	100.2 KiB	100.7 KiB	+0.4 KiB	+0.45%	+0.1 KiB	+6
windows	shell	810.2 KiB	810.2 KiB	0.0 KiB	0.00%	0.0 KiB	+0
windows	components-button	50.0 KiB	57.2 KiB	+7.2 KiB	+14.43%	+2.4 KiB	+17
windows	components-catalog	267.0 KiB	281.2 KiB	+14.2 KiB	+5.31%	+5.1 KiB	+24
windows	design-theme-state	33.2 KiB	33.7 KiB	+0.5 KiB	+1.36%	+0.1 KiB	+6
windows	design-themed-root	New	36.0 KiB	New	New	New	New
windows	design-color-lib	7.1 KiB	7.1 KiB	0.0 KiB	0.00%	0.0 KiB	+0
windows	design-theme-state-legacy-source	35.3 KiB	35.7 KiB	+0.4 KiB	+1.27%	+0.1 KiB	+6
windows	design-legacy-theme-from-flex	100.0 KiB	100.4 KiB	+0.4 KiB	+0.44%	+0.1 KiB	+6

The job is advisory: size changes are reported but do not fail the pull request. Bundle or analysis errors still fail.

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