feat: target AKM 0.9.7

[itlackey]

Summary

• raise the supported AKM floor and bundled dependency to ^0.9.7
• expose token-budgeted packed curation through OpenCode and Claude
• update fake contracts, version gates, tests, and user documentation

Validation

• 287 Bun tests pass
• OpenCode and Claude TypeScript checks pass
• Tier 2 matches baseline with no regressions
• Tier 3 stub smoke passes
• real akm-cli 0.9.7 pack contract verified

[github-actions]

Eval diff

• Baseline SHA: 83de80205da91f6789ffeb9b063f8b89ed91f730
• Candidate SHA: ecc626f41b271d95da5077962569ab379d9ae90f

Metric deltas

Metric	Key	Baseline	Candidate	Δ	Δ%	Status
curation	mean_expected_coverage	0.9125	0.9125	0	0.00%	• unchanged
curation	mean_reciprocal_rank	0.9208	0.9208	0	0.00%	• unchanged
curation	zero_hit_rate	0.0500	0.0500	0	0.00%	• unchanged
context_budget	claude_violations	0	0	0	0.00%	• unchanged
context_budget	opencode_violations	0	0	0	0.00%	• unchanged
context_budget	claude_drop_rate	0	0	0	0.00%	• unchanged
context_budget	opencode_drop_rate	0	0	0	0.00%	• unchanged
feedback	claude_precision	1	1	0	0.00%	• unchanged
feedback	claude_recall	1	1	0	0.00%	• unchanged
feedback	claude_polarity_flips	0	0	0	0.00%	• unchanged
feedback	opencode_precision	1	1	0	0.00%	• unchanged
feedback	opencode_recall	1	1	0	0.00%	• unchanged
feedback	opencode_polarity_flips	0	0	0	0.00%	• unchanged

Plugin surface

No surface changes.

No regressions.