fix(server): Kiro offers reasoning effort for Fable 5.1 and Kimi K3

[hstern]

Problem

On #14693, claude-fable-5.1 has no Reasoning option in the Kiro model picker, and the server rejects a reasoningEffort for it (reported in #14693 (comment) by @ash663). kimi-k3 has the same gap. Both are missing from KIRO_MODEL_EFFORT.

Change

Adds both models to KIRO_MODEL_EFFORT with the levels a live Kiro session advertises for them:

• claude-fable-5.1: low, medium, high, xhigh, max (default high)
• kimi-k3: low, high, max (default max)

The effort test now covers both.

Scope and approval

This targets v2/kiro-acp (#14693), not main. It fills in that PR's existing effort table, so it adds no new capability.

Verification

• I opened one kiro-cli acp --agent-engine=v3 --auth-method=cli session on kiro-cli 2.31.0 with no prompt and read the model option's _meta.kiro.effortLevels / defaultEffortLevel. Every model already in the table matches what Kiro advertises. Only these two were missing.
• vp test run src/provider/KiroProvider.test.ts: 9 passed.

Written by Claude Opus 5.5 in Claude Code (via T3 Code).

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — The production provider now exposes reasoning controls for two models and establishes high/max as their default selections, changing product-facing defaults. The implementation is small and tested, but that default change warrants human review.

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[maria-rcks]

Note

Written by claude-opus-5-5 on behalf of Maria

Thanks for this. I'm closing it as part of PR triage. Right now we're only taking focused bug fixes from outside contributors (see Read this first), and this PR is not one.

From the review: This adds Fable 5.1 and Kimi K3 reasoning options to the Kiro integration, which is absent from main. Model support additions need prior maintainer agreement.

If you think this was a mistake, message me on Twitter at @maria_rcks and I'll take another look.