Make task history previews content-first

[yuna-fuzzland]

Summary

• Add shared monitor task text sanitization for subjects and descriptions so visible task text is content-first.
• Sanitize monitor task create/update paths, daemon workflow snapshots, and desktop fallback rendering.
• Backfill legacy monitor task display reads without putting Telegram/source/judgment wording into the visible description.

Test Plan

• cargo fmt --check
• pnpm exec svelte-check --tsconfig ./tsconfig.json
• cargo test -p puffer-core monitor_task_text::tests::sanitizer_prefers_original_message_quotes
• cargo test -p puffer-core runtime::tests::tool_execution::workflow::workflow_monitor_task
• cargo test -p puffer-cli workflow_snapshot_includes_monitor_tasks
• PUFFER_DESKTOP_TEST_PORT=1429 pnpm exec playwright test tests/tasks-ui.spec.ts -g "monitor task detail sanitizes"

Note: svelte-check still reports the existing Workflows.svelte unused CSS selector warnings.

[vercel]

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[yuna-fuzzland]

Follow-up update:\n\n- Added content-first rules for monitor TaskCreate descriptions.\n- Descriptions now instruct the triage agent to omit Telegram/source prefixes, keep source info in metadata, and summarize clear errors, questions, requests, or incomplete content according to the agreed preview rules.\n- Covered both daemon and command-helper monitor prompts with prompt contract tests.\n\nVerified with:\n- cargo test -p puffer-cli monitor_prompt\n- cargo test -p puffer-core monitor_prompt\n- cargo test -p puffer-cli message_summary

[yuna-fuzzland]

Follow-up: tightened monitor task text handling at persistence time.\n\n- Sanitizes monitor TaskCreate subject/description before storing.\n- Sanitizes monitor TaskUpdate subject/description before storing, including existing monitor tasks and incoming monitor metadata.\n- Removes source/judgment language such as Telegram, message asks, actionable request case-insensitively.\n- Keeps source details in metadata only; existing persisted tasks are not migrated.\n- Added create/update regression tests and specs/puffer-core/252.md.