chore(github-copilot): refresh model catalog

providers/github-copilot/models/claude-fable-5.1.toml

@@ -0,0 +1,11 @@
+# Sources:
+# - https://github.blog/changelog/2026-09-01-claude-fable-5-1-generally-available-in-github-copilot
+# - https://docs.github.com/en/copilot/reference/copilot-billing/models-and-pricing
+base_model = "anthropic/claude-fable-5-1"
+reasoning_options = [{ type = "effort", values = ["low", "medium", "high", "xhigh", "max"] }]
+
+[cost]
+input = 10
+output = 50
+cache_read = 0.25
+cache_write = 12.5

providers/github-copilot/models/gemini-3.8-flash.toml

@@ -0,0 +1,18 @@
+# Sources:
+# - https://github.blog/changelog/2026-09-03-gemini-3-8-flash-is-now-available-in-github-copilot
+# - https://docs.github.com/en/copilot/reference/copilot-billing/models-and-pricing
+base_model = "google/gemini-3.8-flash"
+reasoning_options = [{ type = "effort", values = ["low", "medium", "high"] }]
+
+[cost]
+input = 0.75
+output = 3.75
+cache_read = 0.075
+
+[limit]
+context = 1_000_000
+input = 936_000
+output = 64_000
+
+[modalities]
+input = ["text", "image"]