refactor: restructure add-gmail skill for new skill architecture

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/skills/add-gmail/modify/src/config.ts.intent.md

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+# Intent: src/config.ts modifications
+
+## What changed
+Added configuration exports for Gmail channel support.
+
+## Key sections
+- **readEnvFile call**: Must include `GMAIL_CHANNEL_ENABLED` in the keys array. NanoClaw does NOT load `.env` into `process.env` — all `.env` values must be explicitly requested via `readEnvFile()`.
+- **GMAIL_CHANNEL_ENABLED**: Boolean feature flag — when `true`, the Gmail channel is connected and polls for inbound emails. When `false` (default), Gmail is available as a tool only (agent can read/send emails when asked from other channels).
+
+## Invariants
+- All existing config exports remain unchanged
+- New Gmail keys are added to the `readEnvFile` call alongside existing keys
+- New exports are appended at the end of the file
+- No existing behavior is modified — Gmail config is additive and minimal
+- Both `process.env` and `envConfig` are checked (same pattern as `ASSISTANT_NAME`)
+
+## Must-keep
+- All existing exports (`ASSISTANT_NAME`, `POLL_INTERVAL`, `TRIGGER_PATTERN`, etc.)
+- The `readEnvFile` pattern — ALL config read from `.env` must go through this function
+- The `escapeRegex` helper and `TRIGGER_PATTERN` construction