catalog: add linear preset v1.0.0

[derobiwan]

Summary

Adds the linear community preset entry to presets/catalog.community.json. Pairs with the forthcoming linear extension submission opened as github/spec-kit#2603.

The pair (--extension linear --preset linear) replaces local-file storage with Linear-as-storage-backend: all Spec-Driven Development artifacts ([CONSTITUTION], [SPEC], [PLAN], [RESEARCH], [DATA-MODEL], [CONTRACT], [QUICKSTART], [CHECKLIST], individual tasks) persist as Linear issues with the dual-label convention (speckit:<type> + feature:NNN-name) via the official Linear MCP server.

Test plan

• preset.yml validates against schema_version 1.0
• presets/catalog.community.json parses as valid JSON after the edit
• Entry inserted in alphabetical order (between jira and mde)
• download_url resolves anonymously (verified with curl -I https://github.com/derobiwan/speckit-linear/archive/refs/tags/v1.0.0.zip → HTTP 200)
• repository URL resolves anonymously
• requires.speckit_version uses the >=X.Y.Z form
• provides.commands matches the count of type: command entries in preset.yml (9)
• License: MIT, LICENSE file present in the source repo
• No secrets in release artifact (gitleaks scan: 0 findings)

Release info

• Source: https://github.com/derobiwan/speckit-linear
• Release: https://github.com/derobiwan/speckit-linear/releases/tag/v1.0.0
• License: MIT
• Pairs with extension submission: [Extension]: Add linear #2603

Description (mirrors preset.yml verbatim, FR-013)

Replaces local-file storage with Linear-as-storage-backend. Pairs with the 'linear' extension. All Spec-Driven Development artifacts persist as Linear issues with dual labels (speckit:* + feature:NNN-name).

Notes for reviewers

• The preset wraps 9 core /speckit.* command templates (constitution, specify, clarify, plan, tasks, checklist, analyze, implement, taskstoissues). Each wrapper runs a before_* hook to resolve the active Linear feature, executes the upstream template body, then runs an after_* hook to persist the produced artifact as a Linear issue.
• Strategy: wrap (preserves upstream's template body; adds Linear persistence before/after).
• The corresponding extension submission (#2603) provides the 16 /speckit.linear.* commands and 18 hooks that the preset wrappers call into.

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