refactor: extract shared helpers to deduplicate repeated code patterns (#7917)

* refactor: add shared helper modules for code deduplication

New modules:
- gateway/platforms/helpers.py: MessageDeduplicator, TextBatchAggregator,
  strip_markdown, ThreadParticipationTracker, redact_phone
- hermes_cli/cli_output.py: print_info/success/warning/error, prompt helpers
- tools/path_security.py: validate_within_dir, has_traversal_component
- utils.py additions: safe_json_loads, read_json_file, read_jsonl,
  append_jsonl, env_str/lower/int/bool helpers
- hermes_constants.py additions: get_config_path, get_skills_dir,
  get_logs_dir, get_env_path

* refactor: migrate gateway adapters to shared helpers

- MessageDeduplicator: discord, slack, dingtalk, wecom, weixin, mattermost
- strip_markdown: bluebubbles, feishu, sms
- redact_phone: sms, signal
- ThreadParticipationTracker: discord, matrix
- _acquire/_release_platform_lock: telegram, discord, slack, whatsapp,
  signal, weixin

Net -316 lines across 19 files.

* refactor: migrate CLI modules to shared helpers

- tools_config.py: use cli_output print/prompt + curses_radiolist (-117 lines)
- setup.py: use cli_output print helpers + curses_radiolist (-101 lines)
- mcp_config.py: use cli_output prompt (-15 lines)
- memory_setup.py: use curses_radiolist (-86 lines)

Net -263 lines across 5 files.

* refactor: migrate to shared utility helpers

- safe_json_loads: agent/display.py (4 sites)
- get_config_path: skill_utils.py, hermes_logging.py, hermes_time.py
- get_skills_dir: skill_utils.py, prompt_builder.py
- Token estimation dedup: skills_tool.py imports from model_metadata
- Path security: skills_tool, cronjob_tools, skill_manager_tool, credential_files
- Non-atomic YAML writes: doctor.py, config.py now use atomic_yaml_write
- Platform dict: new platforms.py, skills_config + tools_config derive from it
- Anthropic key: new get_anthropic_key() in auth.py, used by doctor/status/config/main

* test: update tests for shared helper migrations

- test_dingtalk: use _dedup.is_duplicate() instead of _is_duplicate()
- test_mattermost: use _dedup instead of _seen_posts/_prune_seen
- test_signal: import redact_phone from helpers instead of signal
- test_discord_connect: _platform_lock_identity instead of _token_lock_identity
- test_telegram_conflict: updated lock error message format
- test_skill_manager_tool: 'escapes' instead of 'boundary' in error msgs

agent/skill_utils.py

@@ -12,7 +12,7 @@ import sys
 from pathlib import Path
 from typing import Any, Dict, List, Set, Tuple
 
-from hermes_constants import get_hermes_home
+from hermes_constants import get_config_path, get_skills_dir
 
 logger = logging.getLogger(__name__)
 
@@ -130,7 +130,7 @@ def get_disabled_skill_names(platform: str | None = None) -> Set[str]:
     Reads the config file directly (no CLI config imports) to stay
     lightweight.
     """
-    config_path = get_hermes_home() / "config.yaml"
+    config_path = get_config_path()
     if not config_path.exists():
         return set()
     try:
@@ -178,7 +178,7 @@ def get_external_skills_dirs() -> List[Path]:
     path.  Only directories that actually exist are returned.  Duplicates and
     paths that resolve to the local ``~/.hermes/skills/`` are silently skipped.
     """
-    config_path = get_hermes_home() / "config.yaml"
+    config_path = get_config_path()
     if not config_path.exists():
         return []
     try:
@@ -200,7 +200,7 @@ def get_external_skills_dirs() -> List[Path]:
     if not isinstance(raw_dirs, list):
         return []
 
-    local_skills = (get_hermes_home() / "skills").resolve()
+    local_skills = get_skills_dir().resolve()
     seen: Set[Path] = set()
     result: List[Path] = []
 
@@ -230,7 +230,7 @@ def get_all_skills_dirs() -> List[Path]:
     The local dir is always first (and always included even if it doesn't exist
     yet — callers handle that).  External dirs follow in config order.
     """
-    dirs = [get_hermes_home() / "skills"]
+    dirs = [get_skills_dir()]
     dirs.extend(get_external_skills_dirs())
     return dirs
 
@@ -384,7 +384,7 @@ def resolve_skill_config_values(
     current values (or the declared default if the key isn't set).
     Path values are expanded via ``os.path.expanduser``.
     """
-    config_path = get_hermes_home() / "config.yaml"
+    config_path = get_config_path()
     config: Dict[str, Any] = {}
     if config_path.exists():
         try: