fix/wire in agents debug mode logging

[munimunigamer]

Migrated from Pasta-Devs/Marinara-Engine-Refactor#57: Pasta-Devs/Marinara-Engine-Refactor#57
Original author: @Promansis
Target base: Pasta-Devs/Marinara-Engine refactor
Source draft state: True
Verification after port: pnpm typecheck
Port note: the source branch included an inherited avatar-crop commit; this target branch ports the debug-logging work only because Refactor PR #55 is migrated separately.

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Linked issue

Fixes #34

Why this change

This adds visible debug-mode output for agent execution so prompt, response, tool-call, tool-result, and batch details can be inspected in the in-app agent debug panel during generation.

What changed

• Wired debugMode and debugSink through the TypeScript generation/agent runtime.
• Added structured agent debug entries in the engine so debug information is collected centrally instead of being silent.
• Updated the settings help text to describe the in-app debug panel.
• Moved the agent debug entry type into the shared engine contract.

Validation

• pnpm typecheck
• pnpm build
• cargo check --manifest-path src-tauri/Cargo.toml
• pnpm check:docs when docs, skills, or repo guidance changed
• Ran pnpm tauri dev and tested the app path manually
• Verified the affected feature in the right mode(s): chat, roleplay, game, settings/providers, imports/exports, or assets

Manual verification notes

Not run in this handoff.

Docs impact

• No docs changes needed
• Updated docs/developer/* or repo guidance as needed

UI evidence

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