[Change] Spec-Kit Change Proposal Bridge & Backlog Extension Sync

[djm81]

Change Proposal: speckit-03-change-proposal-bridge

Change folder: openspec/changes/speckit-03-change-proposal-bridge/

Why

Users need to draft OpenSpec change proposals from spec-kit feature folders and synchronize backlog issues between spec-kit extensions and SpecFact. Currently no bridge exists to convert between spec-kit features and OpenSpec changes, and spec-kit backlog extensions (Jira, ADO, Linear) can create duplicate issues when SpecFact also syncs to the same tools.

What Changes

• Bidirectional conversion: spec-kit feature → OpenSpec change proposal and vice versa
• Backlog extension issue detection: detect issues created by spec-kit Jira/ADO/Linear/GitHub Projects extensions
• Duplicate prevention: skip issue creation during SpecFact backlog sync when spec-kit already created them
• New --mode change-proposal option on specfact sync bridge command
• Profile-aware sync behavior (solo/team/enterprise)

Capabilities

• New: speckit-change-proposal-bridge, speckit-backlog-extension-sync
• Modified: backlog-sync

Blocked By

• specfact-cli #453 (speckit-02-v04-adapter-alignment) — requires ToolCapabilities.extension_commands

Validation

• ✅ openspec validate --strict passed
• ✅ No breaking changes detected (all additive)
• See CHANGE_VALIDATION.md in change folder