UN-3458 [MISC] Add dormant v2 PR template for spec compliance

.github/pull_request_template_v2.md

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+# Context
+
+### Spec PR
+<!-- Link to the merged spec repo PR that authorizes this work. This PR is blocked until the spec PR is merged. -->
+Zipstack/unstract-review-context#____
+
+### Summary
+<!-- One paragraph describing what this implementation delivers. -->
+
+### Implementation Ticket
+<!-- Link to the originating Jira ticket. -->
+
+---
+
+# Implementation Plan
+
+## Exit Criteria (Definition of Done)
+<!-- What conditions must be true for this PR to be considered complete? -->
+
+- [ ] All CI checks pass
+- [ ] Acceptance criteria from spec PR verified
+- [ ] Documentation updated (if applicable)
+- [ ] No regressions introduced
+
+## Implementation Constraints
+<!-- Are there any constraint exceptions being requested? If none, state "No exceptions requested." -->
+
+## Sequencing & Dependencies
+<!-- Which PRs or branches must merge before this? Which PRs does this block? -->
+
+- Depends on: #____
+- Blocks: #____
+
+## Verification Plan
+<!-- How is the correctness of this implementation validated? -->
+
+- [ ] Unit tests added/updated
+- [ ] Integration tests covering: ...
+- [ ] Performance tests (if applicable): ...
+- [ ] Manual verification steps: ...
+
+## Rollout Strategy
+<!-- How does this change reach production safely? -->
+
+- [ ] Feature flag: `flag_name`
+- [ ] Migration required: [ ] reversible [ ] irreversible
+- [ ] Canary / staged rollout plan: ...
+- [ ] Monitoring / alerting in place for: ...
+
+---
+
+# Testing Evidence
+
+## Test Results
+<!-- Paste or link CI output, coverage reports, or manual test evidence. -->
+
+## Risk Assessment
+<!-- What could go wrong with this change? How is that risk mitigated? -->
+
+| Risk | Likelihood | Impact | Mitigation |
+|------|------------|--------|------------|
+|      |            |        |            |
+
+---
+
+<!-- ================================================================== -->
+<!-- BELOW THIS LINE IS AGENT-GENERATED. DO NOT EDIT.                   -->
+<!-- The reviewer agent compiles this section automatically by          -->
+<!-- cross-checking the PR diff against Spec Compliance artifacts in    -->
+<!-- the spec repo (unstract-review-context).                          -->
+<!-- ================================================================== -->
+
+# Spec Compliance Report
+
+## Verdict
+<!-- PASS / CONFLICT DETECTED — escalated to @org/architects -->
+
+## Spec PR Linkage
+<!-- Verified: spec PR merged / Missing / Mismatched -->
+
+## Compliance Checks
+
+### Product Requirements
+
+#### Acceptance Criteria
+<!-- Does the implementation satisfy the defined business behavior? -->
+
+#### Scope Definition
+<!-- Does the implementation stay within defined scope boundaries? -->
+
+#### Non-Functional Requirements
+<!-- Does the code meet performance, availability, and resource contracts? -->
+
+#### Dependencies
+<!-- Are all dependencies used in this PR present in the approved registry? -->
+
+#### Assumptions & Constraints
+<!-- Does the code violate any active assumptions or constraints? -->
+
+### Specification
+
+#### Architecture Decision Records (ADRs)
+<!-- Does the code conform to active architectural decisions? -->
+
+#### API / Interface Contracts
+<!-- Do request/response schemas match the approved contracts? -->
+
+#### Data Model & State Ownership
+<!-- Does the code respect entity ownership and state transition rules? -->
+
+#### Failure Modes & Resilience
+<!-- Are required resilience patterns (retries, timeouts, circuit breakers) present? -->
+
+#### Security Considerations
+<!-- Are trust boundaries, auth mechanisms, and privilege models respected? -->
+
+#### Implementation Constraints
+<!-- Does the code avoid forbidden patterns and follow required patterns? -->
+
+## Conflicts (if any)
+
+| # | Artifact | File:Line | Violation | Severity |
+|---|----------|-----------|-----------|----------|
+|   |          |           |           |          |
+
+## Recommendation
+<!-- Resolve conflicts before re-requesting review. If any conflict requires -->
+<!-- amending a Spec artifact, raise a new spec PR first.                    -->