Add Stable Identifiers preset to community catalog

[ira-at-work]

Preset Submission

• Preset Name: Stable Identifiers
• Preset ID: stable-identifiers
• Version: 0.1.0
• Author: Ira Abramov
• Repository: https://github.com/ira-at-work/spec-kit-preset-stable-identifiers
• Release: https://github.com/ira-at-work/spec-kit-preset-stable-identifiers/releases/tag/v0.1.0

Summary

Adds the community preset Stable Identifiers, which makes Spec Kit
identifiers (FR/SC/CHK and task T-numbers) sparse and permanent so
they are never renumbered or re-issued — inserts use the gap, removals leave
permanent holes:

• presets/catalog.community.json — new entry inserted in alphabetical order
  (between specassay and test-first-governance); top-level updated_at bumped.
• docs/community/presets.md — new row added to the community presets table.

Requires Spec Kit >=0.10.0. Provides 3 templates, 6 commands. License: MIT.

Checklist

• Valid preset.yml manifest
• Usage README with a valid specify preset add --from <download-url> command, linked from documentation
• LICENSE file included
• GitHub release created with version tag (v0.1.0)
• Preset tested with specify preset add --dev
• Templates resolve correctly
• Commands register to agent directories
• Added to presets/catalog.community.json
• Added row to docs/community/presets.md

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Posted on behalf of @ira-at-work by pi (model: qwen3.8:27b-mlx, autonomous). This PR modifies only presets/catalog.community.json and docs/community/presets.md; ready for the preset-submission label.