fix(models): complete kimi-k3 rollout across Kimi-direct catalog surfaces

Follow-up widening for salvaged PRs #67115, #67685, #67620:

- _PROVIDER_MODELS: add kimi-k3 atop kimi-coding / moonshot / opencode-go
  curated lists (kimi-coding-cn covered by cherry-picked #67620)
- setup.py _DEFAULT_PROVIDER_MODELS: kimi-k3 for kimi-coding(-cn) + opencode-go
- model_metadata: align DEFAULT_CONTEXT_LENGTHS kimi-k3 entry to 1,048,576
  (matches endpoint-scoped override, models.dev, and OpenRouter live metadata)
- anthropic_adapter: classify the bare Coding Plan slug 'k3' (and k3.x/k3-*)
  as Kimi family so adaptive thinking applies on proxied endpoints
- moonshot_schema: is_moonshot_model matches bare 'k3' so tool-schema
  sanitization runs on the chat-completions path
- contributor mappings for githubespresso407, datachainsystems, Punyko8

Tests: 582 passed across 11 targeted files; hermetic E2E verifies picker
order (kimi-k3 first), no dupes, and 1M context resolution.

hermes_cli/models.py

@@ -319,6 +319,7 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "minimaxai/minimax-m3",
     ],
     "kimi-coding": [
+        "kimi-k3",
         "kimi-k2.7-code",
         "kimi-k2.6",
         "kimi-k2.5",
@@ -344,6 +345,7 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "step-3.5-flash-2603",
     ],
     "moonshot": [
+        "kimi-k3",
         "kimi-k2.6",
         "kimi-k2.5",
         "kimi-k2-thinking",
@@ -466,6 +468,7 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "nemotron-3-ultra-free",
     ],
     "opencode-go": [
+        "kimi-k3",
         "kimi-k2.7-code",
         "kimi-k2.6",
         "kimi-k2.5",