Add missing Claude Opus multiplier aliases and correct GPT-5.5 multipliers for 2026-05-30 inventory

[Copilot]

The 2026-05-30 model inventory found no alias coverage gaps, but it did identify missing multiplier entries for Claude Opus 4.7/4.8 variants. The inventory's reported gpt-5.5 discrepancy was also corrected in this PR, updating the stored multipliers to match the documented value.

• Registry updates

  • Added the missing Claude Opus multiplier aliases to pkg/cli/data/model_multipliers.json:
    • claude-opus-4-8
    • claude-opus-4.7
    • claude-opus-4.8
  • Corrected the gpt-5.5 multipliers in pkg/cli/data/model_multipliers.json:
    • gpt-5.5: 57.0
    • gpt-5.5-2026-04-23: 57.0

• Coverage lock-in

  • Added a focused regression test for the 2026-05-30 inventory update in pkg/cli/effective_tokens_test.go.
  • Updated the related assertions so the test covers both the new Claude Opus aliases at 27.0 and the corrected gpt-5.5 multipliers at 57.0.

• Documentation sync

  • Updated docs/src/content/docs/reference/model-tables.md so the published multiplier table matches the registry values for gpt-5.5 and gpt-5.5-2026-04-23.

• Data consistency

  • Preserved the existing ordering convention in the multiplier registry so the new aliases sit with the rest of the Claude Opus entries.

Example of the added Claude Opus registry entries:

"claude-opus-4-6": 27.0,
"claude-opus-4-7": 27.0,
"claude-opus-4-8": 27.0,
"claude-opus-4.6": 27.0,
"claude-opus-4.7": 27.0,
"claude-opus-4.8": 27.0

[pelikhan]

@copilot sry gpt-5.5

[Copilot]

@copilot sry gpt-5.5

Fixed in cb0fc94: updated gpt-5.5 and gpt-5.5-2026-04-23 to 57.0, refreshed the regression assertions, and synced the model table docs.

[Copilot]

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• Files reviewed: 4/4 changed files
• Comments generated: 1