docs: fix pre-existing broken links surfaced by docs-lint

Problem: docs-lint (added in the wiki-hq reorg) surfaced 126 broken relative
links that predated this session — a container rename, incident/plan docs
that moved into archive/done subfolders without their inbound links being
updated, and a handful of relative-depth bugs in files nested under
containers/archive/ and plans/done/.

Fixes applied, by category:
- 124-authentik.md -> 106-auth-outpost.md (container was renamed; ~40 refs).
- investigations/{2026-04-21-hubris-crash-loop,2026-05-31-authentik-vps-migration}.md
  -> archive/ prefix (both moved to investigations/archive/ previously).
- plans/{2026-06-01-slate-ax-to-sodola-migration,2026-06-04_130000-deprecate-claudio-bot,
  2026-06-25-yuvomi-deployment}.md -> plans/done/ prefix.
- Depth bugs in files nested one level deeper than their siblings assumed
  (investigations/archive/*, knowledge/wiki/containers/archive/*,
  plans/done/*) — corrected relative-path depth.
- Destroyed containers with no surviving page (126-plato) delinked to the
  containers/index.md archaeology row instead of a 404.
- ludo-mini.yaml -> strong.yaml (host was renamed, same physical machine).
- netbird-vps.md (no narrative page exists) -> netbird-vps.yaml (substrate
  record, matching the existing convention for hosts without a wiki page).
- runbook-dpkg-interrupted.md refs -> .agents/skills/runbook-dpkg-interrupted/SKILL.md
  (missed in the phase-4 runbook move because the referencing files used a
  bare filename, not a runbooks/ prefix).
- One dangling forward-reference to a never-written investigation delinked
  to the actual incident record it was describing.

Left alone: two links in knowledge/wiki/containers/101-jellyfin.md into
devops/homelab-authentik-admin/ — an intentional reference to a sibling repo,
not present in this checkout.

Verification: broken-link count 126 -> 2 (real remainder is the cross-repo
reference above); gen-topology.py --check still exit 0; build_host_files.py
still idempotent; all inventory.yaml doc_page targets still resolve.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

knowledge/wiki/containers/121-caddy.md

@@ -37,9 +37,9 @@ The reverse proxy. Terminates TLS for every `*.hubris.network` hostname on the L
 
 ## Snippet: `(authentik)` forward-auth
 
-A snippet at the top of the Caddyfile (used as `import authentik` in any site block) wires forward-auth to the embedded Authentik outpost. It points at `http://192.168.8.180:9000` directly (NOT `https://auth.hubris.network`) to avoid Caddy-to-self round-tripping that strips `X-Forwarded-Host`. The forward-auth block must explicitly set `header_up X-Forwarded-Host {host}`. See [Authentik](124-authentik.md#forward-auth-domain-level-setup).
+A snippet at the top of the Caddyfile (used as `import authentik` in any site block) wires forward-auth to the embedded Authentik outpost. It points at `http://192.168.8.180:9000` directly (NOT `https://auth.hubris.network`) to avoid Caddy-to-self round-tripping that strips `X-Forwarded-Host`. The forward-auth block must explicitly set `header_up X-Forwarded-Host {host}`. See [Authentik](106-auth-outpost.md#forward-auth-domain-level-setup).
 
-For apps with mobile clients, `/api/*` (or equivalent) bypasses forward-auth — see the per-app gotchas in [Authentik](124-authentik.md).
+For apps with mobile clients, `/api/*` (or equivalent) bypasses forward-auth — see the per-app gotchas in [Authentik](106-auth-outpost.md).
 
 ## Caddy environment
 
@@ -60,7 +60,7 @@ Gitea webhook id 2 on `dtoro/caddy-conf`. Receiver, deploy script, install scrip
 
 ## Related
 - [DNS split-horizon](../infrastructure/dns.md) — must add entry for every new subdomain
-- [Authentik (124)](124-authentik.md) — forward-auth + IdP
+- [Authentik (124)](106-auth-outpost.md) — forward-auth + IdP
 - [Auto-deploy](../infrastructure/auto-deploy.md)
 - [Public ingress (VPS traefik)](../infrastructure/ingress.md) — mirrors Caddy's certs to the VPS for public exposure
 - [Gitea (104)](104-gitea.md) — webhook source