docs(design): MCP-into-gptel + gh-as-gptel-tool specs + MCP phases

Two new design docs in docs/design/ covering the next two GPTel
work items, plus matching task scaffolding in todo.org.

mcp-el-gptel-integration.org wires mcp.el into the config so GPTel
gets access to the nine MCP servers Claude Code already uses
(linear, notion, figma, slack-deepsat, drawio, google-calendar,
google-docs-personal, google-docs-work, google-keep). The design
covers async startup, the write-confirmation policy, a
server-enablement defcustom, a doctor with live-auth-check, the
audit buffer, and the mcp.el compatibility layer. The spec is at
revision 3 after two code-review passes flagged a critical
confirmation gap (gptel-confirm-tool-calls nil at ai-config.el:386
silently ignored per-tool :confirm slots) and several incorrect
mcp.el API assumptions. Both are addressed.

gptel-gh-tool.org wraps the gh CLI as a hybrid surface: 14 typed
read wrappers plus one general write tool gated by :confirm t.
Host/repo resolution is command-aware: --repo HOST/OWNER/REPO for
repo commands, --hostname only for api and auth status. The runner
enforces an irreversible-command blocklist, a 64KB in-flight output
cap, and a debug-record plus last-error-buffer story. The spec is
at revision 2 after a code-review pass corrected gh flag
assumptions and reframed the safety story around per-tool confirm.

todo.org gains a link to the MCP spec under the parent task plus
nine TODO sub-tasks (one per implementation phase), and a new
gh-tool TODO with the same spec-link shape.

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