Implement IRC bridge socket adapter

[absalonCRC]

Summary

• replaces the bridge-irc placeholder with a real Node TCP/TLS IRC client path
• registers IRC nick/user/PASS or SASL, joins subscribed channels, replies to PING, and maps PRIVMSG lines into BridgeMessage payloads
• sends relayed bridge messages as split IRC PRIVMSG lines, including attachment URLs as plain text
• adds mocked socket coverage for TLS send, plaintext PASS, subscribe/PING/PRIVMSG mapping, and SASL password validation

Validation

• npx --yes pnpm@9.12.0 vitest run packages/bridges/irc/src/index.test.ts
• npx --yes pnpm@9.12.0 --filter @profullstack/sh1pt-bridge-irc typecheck
• npx --yes pnpm@9.12.0 --filter @profullstack/sh1pt-bridge-irc build
• git diff --check
• focused secret scan over packages/bridges/irc/src

No real IRC credentials or network connection were used; tests mock Node sockets.

Refs #6. If accepted for UGig settlement, receive-only SOL address: 27sdMYXofqoM9qR13bZhccRNYeEgYn5EoHXTSJn4QWKP

Payment fallback: PayPal cultofrozen@gmail.com

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