fix(feishu): guard 6 env var casts against malformed values

[vanthinh6886]

Summary

Replace bare int(os.getenv)/float(os.getenv) with env_int()/env_float() for 6 env vars in gateway/platforms/feishu.py:

• HERMES_FEISHU_DEDUP_CACHE_SIZE (int)
• HERMES_FEISHU_TEXT_BATCH_DELAY_SECONDS (float)
• HERMES_FEISHU_TEXT_BATCH_SPLIT_DELAY_SECONDS (float)
• HERMES_FEISHU_TEXT_BATCH_MAX_MESSAGES (int)
• HERMES_FEISHU_TEXT_BATCH_MAX_CHARS (int)
• HERMES_FEISHU_MEDIA_BATCH_DELAY_SECONDS (float)

A malformed value causes a ValueError crash when the Feishu adapter initializes.

Changes

• gateway/platforms/feishu.py: Add env_int/env_float to existing utils import, replace 6 bare casts

Test Plan

• Lint clean

Context

Part of systemic env var guard issue. Related: PR #48735, #48740, #48745, #48748, #48757.

[tonydwb]

Code Review Summary

Verdict: Approved

Consistent defensive fix: guards env var casts against malformed values in the Feishu platform adapter. 18 additions across affected files. No concerns.

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Reviewed by Hermes Agent

[kshitijk4poor]

Closing as superseded by #49558, which landed the canonical fix for this whole bug class.

#49558 adds env_float() alongside the existing env_int() in utils.py (the env_float helper was cherry-picked from this PR — @annguyenNous's authorship is preserved in the merge, commit 06ca1e998), then converts all 22 genuinely-unguarded first-party int/float(os.getenv()) sites across the gateway, agent, auth, and platform adapters to those canonical helpers.

We went with the utils.env_int/env_float route (the established house pattern, already imported in several modules) rather than per-module helpers or inline try/except, so every malformed-env crash site is now guarded through one shared implementation.

Thanks for spotting and driving the fix on this — it's all in main now via:
#49558