chore: sync .cursor skills from suite

.cursor/skills/research/steps/01_mode-a-initial-research.md

@@ -73,16 +73,18 @@ Full 8-step research methodology. Produces the first solution draft.
 **Task** (drives the 8-step engine):
 1. Research existing/competitor solutions for similar problems — search broadly across industries and adjacent domains, not just the obvious competitors
 2. Research the problem thoroughly — all possible ways to solve it, split into components; search for how different fields approach analogous problems
-3. For each component, research all possible solutions and find the most efficient state-of-the-art approaches — use multiple query variants and perspectives from Step 1
-4. For each promising approach, search for real-world deployment experience: success stories, failure reports, lessons learned, and practitioner opinions
-5. Search for contrarian viewpoints — who argues against the common approaches and why? What failure modes exist?
-6. Verify that suggested tools/libraries actually exist and work as described — check official repos, latest releases, and community health (stars, recent commits, open issues)
-7. Include security considerations in each component analysis
-8. Provide rough cost estimates for proposed solutions
+3. Derive a **Project Constraint Matrix** before evaluating component options. Extract exact constraints from `problem.md`, `restrictions.md`, `acceptance_criteria.md`, input data notes, and the Phase 1 AC assessment. Include required inputs/outputs, operating context, runtime envelope, data availability, lifecycle boundaries, non-functional targets, integration boundaries, security constraints, and explicit out-of-scope decisions.
+4. For each component, research all possible solutions and find the most efficient state-of-the-art approaches — use multiple query variants and perspectives from Step 1
+5. For each promising approach, search for real-world deployment experience: success stories, failure reports, lessons learned, and practitioner opinions
+6. Search for contrarian viewpoints — who argues against the common approaches and why? What failure modes exist?
+7. Verify that suggested tools/libraries actually exist and work as described — check official repos, latest releases, and community health (stars, recent commits, open issues)
+8. For every candidate component/tool/library/service/pattern/algorithm, prove exact fit against the Project Constraint Matrix. A field-adjacent solution is not selectable unless its documented implementation assumptions match the project's constraints. Mismatches must be recorded as disqualifiers and the candidate marked `Rejected`, `Experimental only`, or `Needs user decision`.
+9. Include security considerations in each component analysis
+10. Provide rough cost estimates for proposed solutions
 
 Be concise in formulating. The fewer words, the better, but do not miss any important details.
 
-**Save action**: Write `OUTPUT_DIR/solution_draft##.md` using template: `templates/solution_draft_mode_a.md`
+**Save action**: Write `RESEARCH_DIR/06_component_fit_matrix.md` before the final draft, then write `OUTPUT_DIR/solution_draft##.md` using template: `templates/solution_draft_mode_a.md`
 
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