docs(proposals): use glob toctree to prevent merge conflicts

[smoparth]

Replace the hand-maintained file list in docs/proposals/index.rst with Sphinx's :glob: directive. This eliminates recurring merge conflicts when multiple proposal PRs are open simultaneously, as new proposals no longer need to modify the index file.

Closes: #1108

• PR follows CONTRIBUTING.md guidelines

[coderabbitai]

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 1429c1a and 1f127f9.

📒 Files selected for processing (1)

• docs/proposals/index.rst

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📝 Walkthrough

Walkthrough

The proposal index documentation file transitions from a manually maintained list of four proposal entries to an automated glob-based pattern. The Sphinx toctree directive now uses :glob: with a wildcard (*) to automatically discover and include all proposal documents in the directory, eliminating the need for manual updates when new proposals are added.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	Title clearly describes the main change: using glob toctree in proposals index to prevent merge conflicts.
Description check	✅ Passed	Description explains the purpose (eliminating merge conflicts), the solution (using :glob: directive), and references the closed issue #1108.
Linked Issues check	✅ Passed	Code changes fully implement issue #1108 requirements: :glob: directive replaces explicit file list, enabling automatic discovery of proposal files without index modifications.
Out of Scope Changes check	✅ Passed	All changes in docs/proposals/index.rst are directly related to implementing the glob toctree pattern specified in issue #1108, with no extraneous modifications.

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