docs: fix plan/repo drift, retire dead Goose+Nomos and Caveman tooling

Documentation and repo-hygiene pass following the client/server split:

Plan drift (audited all other active plans against current code):
- oikos-gaps-and-improvements.md: mark Section C and D.5 resolved (both
  described cmd/hermes, renamed to cmd/nomos with a real LLM loop since);
  refresh ~10 stale file:line citations; fix tool-count (33, not 28).
- liveness-drift-and-ux-cohesion.md: fix stale default-model claim (now
  deepseek-v4-pro since 2026-07-10) and "not yet deployed" status.
- nomos-agent-code-review.md: fix C1's citation (one unauthenticated route
  to nomos now, not two, after the client/server split).
- wails-desktop-app.md: record the production deploy outcome.

Repo structure: added missing directories to README/CONTRIBUTING layout
tables (checks/, tools/, cmd/webhook/, docs/operations/), fixed a broken
link, added ADR 0015 documenting the auth/CORS/client-split model (there
wasn't one despite CONTRIBUTING's own process requiring it), normalized
ADR 0013/0014's format drift, added an Authentication section to
AGENTS.md/CLIENTS.md (every example call was missing the now-required
bearer header).

Retired the Goose+Nomos workstation flow (bootstrap.sh --with-nomos,
tools/setup-nomos-soul.sh, .agents/operations/nomos-agent.md) and the
Caveman auto-install tooling (tools/setup-caveman.sh, tools/caveman/) —
both superseded by the production containerized Nomos agent, which has
never used either. Kept .agents/shared/caveman.md itself (the terse
writing-style convention agents still follow by reading it).

Deleted the orphaned legacy Python oikos/ directory — nothing imports it,
and bin/homelab (the CLI it was kept for) no longer exists in the repo.

Rewrote .agents/operations/agent-enrollment.md (365 -> ~110 lines) and
commands.md to match the current architecture instead of the retired
`homelab` CLI; migrated the still-true networking prerequisites (Netbird,
split-horizon DNS, SSH key distribution) into the knowledge base as a
runbook via upsert_knowledge rather than duplicating them in markdown.
Updated all 10 .agents/skills/ runbooks referencing the dead CLI with
their real MCP tool / REST API equivalents, or flagged them as needing
verification where no equivalent is confirmed yet.

Two real bugs found and fixed, not just docs:
- The tools/setup-*.sh auto-setup glob was tools/*.setup.sh in THREE
  places (tools/post-pull.sh, bootstrap.sh, and internal/httpapi/impl.go's
  GetClientContext handler) since the mechanism's introduction on
  2026-06-02 — never matched any real filename, so no client has ever
  picked up an auto-setup script via git-pull or the context-poller sync.
  Fixed all three; the Go server-side fix is the one that actually matters
  since it's what the current context-poller mechanism depends on.
- bootstrap.sh removed dead vestigial --gitea-token/--gitea-user flags
  (parsed, never consumed) left over from an earlier clone-based model.

Also flagged, not fixed (documented as an open gap in
client-enrollment/SKILL.md): bootstrap.sh tells a freshly-enrolled client
to call POST /api/v1/clients/{slug}/activate to finish enrollment, but
that route doesn't exist in api/openapi.yaml — EnrollClient sets entities
to provisioning and nothing currently transitions them to active.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

plans/2026-07-08-liveness-drift-and-ux-cohesion.md

@@ -1,8 +1,11 @@
 # 2026-07-08 — Liveness, drift, and UX cohesion
 
-**Status:** In Progress — Phases 1–4 code complete; not yet deployed. Phase 5 deferred.
-(Audited 2026-07-11 — still accurate; prompt caching within Phase 4 also
-confirmed not implemented.)
+**Status:** In Progress — Phases 1–4 code complete and now deployed
+(re-verified 2026-07-12: mac-mini was redeployed from `main` that day for
+unrelated auth work — plans/2026-07-12-wails-desktop-app.md — which carried
+every commit up to that point, including this plan's, so "not yet deployed"
+below is stale). Phase 5 deferred. (Audited 2026-07-11 — still accurate;
+prompt caching within Phase 4 also confirmed not implemented.)
 
 - **Phase 1 (drift/staleness):** done. Health/metrics/events misattribution
   fix, staleness sweep, `/entities` health+freshness, dashboard/fleet-health
@@ -26,20 +29,19 @@ confirmed not implemented.)
 - **Phase 4 (agent efficiency):** core piece done — prior turns' tool
   calls/results are now replayed into the conversation (previously dropped
   entirely), and a compact live fleet-health snapshot is injected into the
-  system prompt each turn so the agent starts oriented. Prompt caching and
-  reconsidering the default model are **not done** (lower priority, no
-  measured regression without them).
+  system prompt each turn so the agent starts oriented. Prompt caching is
+  **not done** (lower priority, no measured regression without it).
+  Reconsidering the default model — done, but not by this plan: switched to
+  `deepseek/deepseek-v4-pro` on 2026-07-10 (`cmd/nomos/agent.go:70`) for
+  reliability, per that commit's own comment ("the flash tier over-narrates,
+  occasionally emits canned refusals, and is unreliable at multi-step tool
+  use").
 - **Phase 5 (CRUD):** `PatchEntity` and a full `/checks` CRUD API
   (list/create/patch, including enable/disable) already existed server-side;
   the new Monitoring card's toggle uses `PatchCheck`. **Not done**: a
   "run check now" endpoint (no scheduler on-demand entrypoint exists yet),
   relationship editing, and an entity attribute editor UI.
 
-**Not yet deployed** — the live `oikos-api`/`oikos-scheduler`/nomos
-containers still run the pre-fix binaries; rebuilding and restarting them
-needs an explicit go-ahead since it touches the running homelab control
-plane.
-
 Addresses five felt problems with the current system: (1) the agent reports
 stale machine state as if it were fresh, (2) sessions can't be opened and feel
 disconnected from chat, (3) the Nomos agent re-derives state every turn and