feat: v2.5.0 - disable_thinking, reasoning models, MIT license, security hardening

Features:
- disable_thinking toggle (issue #11) with per-provider semantics:
  OpenAI classic gets /no_think soft-switch, OpenAI reasoning gets
  reasoning_effort=low, DeepSeek gets both, Anthropic no-op (thinking
  opt-in), Gemini 2.5+ gets thinking_budget=0
- OpenAI reasoning model support (o1/o3/o4-mini/gpt-5 family):
  max_completion_tokens, developer role, reasoning_effort
- Per-request disable_thinking override in ask_question service
- Provider-specific temperature clip (Anthropic 0-1, others 0-2)

Security:
- Require API key re-entry on provider change (OptionsFlow)
- Validate Anthropic json_schema before system-prompt concatenation
- Symlink protection in history file operations
- Hardened secret redaction regexes (sk-*, AIza*, x-api-key)
- get_history service: hard cap on limit (default 10, max 100)

Reliability:
- Retry on 502/503/504 in addition to 429/timeout
- Honor Retry-After header on 429
- Exception chaining (raise ... from err)
- _strip_think_blocks handles nested/dangling tags
- normalize_name sha256 fallback for empty-collapse inputs

UI/housekeeping:
- api_key uses TextSelector(type=PASSWORD)
- DeviceInfo entry_type=SERVICE
- Services unregister on last entry unload
- Dependabot for GitHub Actions
- persist-credentials=false in checkout steps
- manifest requirements pinned with upper bounds
- Ignore docs/plans/ (working artifacts)

License: PolyForm Noncommercial 1.0.0 -> MIT

No breaking changes: service response shape, sensor attributes,
entity IDs and on-disk formats unchanged.

custom_components/ha_text_ai/utils.py

@@ -1,7 +1,7 @@
 """
 Utility functions for HA Text AI integration.
 
-@license: PolyForm Noncommercial 1.0.0 (https://polyformproject.org/licenses/noncommercial/1.0.0)
+@license: MIT (https://opensource.org/licenses/MIT)
 @author: SMKRV
 @github: https://github.com/smkrv/ha-text-ai
 @source: https://github.com/smkrv/ha-text-ai
@@ -18,10 +18,19 @@ from homeassistant.core import HomeAssistant
 
 
 def normalize_name(name: str) -> str:
-    """Normalize name to conform to HA naming convention using underscores."""
+    """Normalize name to conform to HA naming convention using underscores.
+
+    If the input collapses to an empty string (all non-alphanumeric or
+    all underscores), fall back to a short hash of the original so that
+    downstream entity IDs never end with a trailing underscore.
+    """
     normalized = ''.join(c if c.isalnum() or c == '_' else '_' for c in name)
-    normalized = '_'.join(filter(None, normalized.split('_')))
-    return normalized.lower()
+    normalized = '_'.join(filter(None, normalized.split('_'))).lower()
+    if not normalized:
+        import hashlib
+        digest = hashlib.sha256(name.encode("utf-8", errors="replace")).hexdigest()[:8]
+        normalized = f"instance_{digest}"
+    return normalized
 
 
 def safe_log_data(