docs(spec): move agent KB to git and fold in migration, metrics, upkeep

The KB leaves the ~/sync/org Syncthing share for its own git repo on cjennings.net (new decision D8). A systemd timer auto-syncs Craig's edits, agents pull before query and commit+push after write, machines replicate by clone (the work machine doesn't), and agent writes land under an agents/ subdirectory. Syncthing's no-history, no-gate, conflict-fork costs were the design's weakest accepted risks, and the phone constraint dissolved: mobile stays on on-demand doc drops to the ~/sync/phone share.

The amendment also folds in inclusion criteria plus a guided per-project memory sweep (Phase 1.5), a Success metrics section with a 30-day checkpoint, the seed node redefined as the KB's own documentation, and monthly hygiene automation (Phase 4). Phases renumbered 0-4. Implementation stays held pending the go-ahead.

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