fix(providers): add claude-sonnet-5 to canonical model registry

[syf2211]

Summary

Add claude-sonnet-5 entries to the canonical model registry so AWS Bedrock users get the correct 1M context window instead of the 128k default fallback.

Motivation

global.anthropic.claude-sonnet-5 on the aws_bedrock provider currently resolves no canonical entry, so with_canonical_limits() leaves context_limit unset and context_limit() falls back to 128,000 tokens. The wiring is correct — this is a pure data gap until models.dev lists the model.

Fixes #10179

Changes

• Add amazon-bedrock/global.anthropic.claude-sonnet-5 to canonical_models.json (context: 1,000,000; output: 64,000), mirroring the claude-sonnet-4.6 global entry
• Add anthropic/claude-sonnet-5 with the same limits and thinking_mode: adaptive
• Register global.anthropic.claude-sonnet-5 in BEDROCK_KNOWN_MODELS for model-picker visibility
• Add anthropic/claude-sonnet-5 to inferred_thinking_mode in build_canonical_models.rs for future registry rebuilds
• Add unit tests for canonical lookup on aws_bedrock and anthropic

Tests

cargo test -p goose-providers with_canonical_limits
cargo test -p goose-providers test_map_to_canonical_model

All 7 with_canonical_limits tests and test_map_to_canonical_model pass.

Notes

• models.dev does not yet list claude-sonnet-5, so these entries are hand-added per the issue's proposed fix. They can be refreshed via cargo run --bin build_canonical_models once models.dev catches up.
• Regional Bedrock variants (e.g. us.anthropic.claude-sonnet-5) are out of scope for this PR; only the global ID reported in claude-sonnet-5 missing from canonical model registry, falls back to 128k context limit on Bedrock #10179 is covered.

[michaelneale]

Nice one, FYI:

$3/$15 vs actual $2/$10 - is probably only tweak (which I think will be corrected when regenerated)

also cargo run --bin build_canonical_models - can regenerate it I think