feat(claude-profile): add provider selection (model + endpoint + credentials)

Introduces provider files (`data/claude-profile/providers/*.yaml`) that
bundle model ID, API base URL, API key source, and extra env vars. Phase 2.5
(provider selection) added between mode selection and launch, with a default
derived from the mode's driver field so existing Anthropic usage is unchanged.

Ships 5 providers: anthropic-haiku/sonnet/opus/opus-1m and minimax-sonnet.
MiniMax token decrypted from agent-runtimes SOPS env, stored at
~/.claude-secrets/minimax-auth-token. Adding new providers = one YAML file,
no script changes.

58 dryrun tests passing (up from 37).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/claude-profile/presets.yaml.example

@@ -39,3 +39,10 @@ hybrid-day:
   project: cluster-bootstrap
   time_horizon: hours
   async: yes
+
+# Quick session via MiniMax (Sonnet-class, pay-per-token, no subscription)
+quick-minimax:
+  profile: oreillyit
+  mode: quick
+  provider: minimax-sonnet
+  project: small-scripts

data/claude-profile/providers/anthropic-haiku.yaml

@@ -0,0 +1,3 @@
+name: anthropic-haiku
+display: Anthropic (Haiku)
+model_id: claude-haiku-4-5-20251001

data/claude-profile/providers/anthropic-opus-1m.yaml

@@ -0,0 +1,3 @@
+name: anthropic-opus-1m
+display: Anthropic (Opus 1M ctx)
+model_id: "claude-opus-4-6[1m]"

data/claude-profile/providers/anthropic-opus.yaml

@@ -0,0 +1,3 @@
+name: anthropic-opus
+display: Anthropic (Opus)
+model_id: claude-opus-4-6

data/claude-profile/providers/anthropic-sonnet.yaml

@@ -0,0 +1,3 @@
+name: anthropic-sonnet
+display: Anthropic (Sonnet)
+model_id: claude-sonnet-4-6

data/claude-profile/providers/minimax-sonnet.yaml

@@ -0,0 +1,10 @@
+name: minimax-sonnet
+display: MiniMax (Sonnet)
+model_id: claude-sonnet-4-20250514
+base_url: https://api.minimax.io/anthropic
+api_key_env: ANTHROPIC_AUTH_TOKEN
+api_key_file: ~/.claude-secrets/minimax-auth-token
+extra_env:
+  CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS: "1"
+  DISABLE_PROMPT_CACHING: "1"
+  CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC: "1"