refactor(logging): adopt pino logger across daemon, memory, ingest, sdk

[meidad]

Replace ad-hoc console.log/error/warn calls with a centralized pino-based logger (src/lib/logger.ts) that pretty-prints in development and emits JSON in production. Every module gets a child logger keyed on its name via createLogger("module-name"); bracket prefixes like "[cron-engine]" are dropped since the module context now lives in the log record.

Errors are passed as { err } so pino's stdSerializers.err formats stack traces correctly. Multi-arg console calls become structured fields. CLI commands (src/cli/) and Ink UI (src/ui/) keep console.log because their chalk-styled output is intentional terminal UX.

Also clears 11 pre-existing oxlint warnings:

• Drops dead variables/imports (diskPath, existingPaths, gwsServices, clientSecretPath, MARKETPLACE_BASE, readdir, execAsync, label).
• Replaces the [...buffers.keys()] spread in flushAll() with a named Array.from() snapshot (the copy is intentional: flush() mutates buffers mid-loop) so the rule no longer fires.
• Swaps NUL-byte sentinels in slack-mrkdwn for U+E000 (Private Use Area) so the no-control-regex rule is satisfied without weakening the "won't collide with real text" guarantee.

pnpm typecheck, pnpm lint (0/0), pnpm test (269/269), pnpm build all pass.

Summary

Changes

Test plan

• pnpm check passes (format, typecheck, lint)
• pnpm test passes
• Manual testing done

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