Archive confine-browse-preset-to-extension into main specs

[strelov1]

Summary

• Docs-only follow-up to Confine the browse preset and agent-driven autofill to the extension's own connection #1991: `openspec archive` folds that change's spec deltas into `assistant-sessions`, `assistant-page-awareness` and `extension-autofill`, and moves the change under `openspec/changes/archive/2026-08-16-confine-browse-preset-to-extension/`.
• No code changes.

Test plan

• `openspec validate --specs`: 211/211 passed

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📥 Commits

Reviewing files that changed from the base of the PR and between 2d2edd0 and fc7b122.

📒 Files selected for processing (10)

• openspec/changes/archive/2026-08-16-confine-browse-preset-to-extension/.openspec.yaml
• openspec/changes/archive/2026-08-16-confine-browse-preset-to-extension/design.md
• openspec/changes/archive/2026-08-16-confine-browse-preset-to-extension/proposal.md
• openspec/changes/archive/2026-08-16-confine-browse-preset-to-extension/specs/assistant-page-awareness/spec.md
• openspec/changes/archive/2026-08-16-confine-browse-preset-to-extension/specs/assistant-sessions/spec.md
• openspec/changes/archive/2026-08-16-confine-browse-preset-to-extension/specs/extension-autofill/spec.md
• openspec/changes/archive/2026-08-16-confine-browse-preset-to-extension/tasks.md
• openspec/specs/assistant-page-awareness/spec.md
• openspec/specs/assistant-sessions/spec.md
• openspec/specs/extension-autofill/spec.md

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