Add Aspire 13.4 breaking-changes reference

[Copilot]

Fixes #24.

Changes

• Adds skills/aspire/references/aspire-13-4-breaking-changes.md as a local, agent-facing scrub list for Aspire 13.4 breaking changes.
• Keeps the existing 13.3 scrub list intact and reframes aspire-breaking-changes.md as a version index that points to local scrub files first, then upstream release notes for gaps.
• Updates skills/aspire/SKILL.md references and the packaged plugin mirror pointer files.
• Updates the PR-review checklist to point reviewers at the version index and pinned scrub files.
• Fixes Vally suite discovery by setting paths.evals: skills, so vally eval --suite ci-gate discovers skills/*/evals/eval.yaml instead of scanning only shared fixture files under evals/.

Validation

• Vally discovery smoke check: scannedCount: 6, matched: 6, errors: 0
• vally lint skills
• vally lint --eval-spec skills/<skill>/evals/eval.yaml for all six skill specs
• npm run bundle

Note: after rebasing onto current main, this repo no longer has an npm run build script; bundle is the remaining package validation script.

[David Pine (IEvangelist)]

Triage note for reviewer — design call worth confirming

This PR goes beyond the literal ask in #24 (which reported the missing 13.4 breaking-changes content): it deletes the inline 13.3 scrub list and replaces it with a single link-only pointer page. Worth a deliberate decision before merge:

Trade-off

	Link-only (this PR)	Inline per-version (status quo + add 13.4)
Stays current	✅ Always	❌ Goes stale each release; needs a PR per version
Agent-grep-able patterns (NameOutput → NameOutputReference, --log-level → --pipeline-log-level, withEnvironment* deprecations, etc.)	❌ Lost	✅ Local, no fetch
Works offline / inside bundle snapshot	❌ Requires WebFetch/curl	✅ Self-contained
Maintenance cost	Low	Moderate (one file per release)

Options

1. Merge as-is — accept the loss of the inline scrub table in exchange for never going stale.
2. Hybrid — keep both: add aspire-13-4-breaking-changes.md (mirroring the existing 13.3 file format), keep aspire-13-3-breaking-changes.md, and add the version-independent pointer this PR introduces as a third reference for "anything past the latest pinned file."
3. Restore 13.3 + add 13.4 inline — straight literal fix to the aspire skills doesn't include 13.4 breaking changes references #24, no link-only page.

Calling it out because option 1 loses real value the original file was providing (a flat, scannable list of identifiers an agent can match against without a network round-trip). The right call depends on how the skill bundle is consumed — happy to defer.

cc David Pine (@IEvangelist)