Phase 1-4: full doc reorg

Phase 1 — fix stale state after strong migration (Phase 1+2, 2026-07-05)
  - README: corrected IPs (jellyfin 206→246, arriman 132→245, etc.),
    added missing containers (128 trmnl, 129 house, 133 seanime, 134 romm,
    124 authentik), updated last-refreshed date, added strong host context
  - containers/101-jellyfin.md: IP 206→246, host hubris→strong, mount
    /mnt/library→/mnt/media_local, GPU 760M→680M+RX7600, privilege→priv
  - containers/118-elementsynapse.md: IP 239→242, added Host: strong
  - containers/122-arriman.md: IP 132→245, mount→/mnt/media_local, added Host
  - containers/129-house.md: IP 212→244, added Host: strong
  - containers/130-grimmory.md: IP 213→247, mount→/mnt/media_local, added Host
  - containers/121-caddy.md: fixed site list (books→grimmory, removed auth→VPS,
    added house, roms, teddy, trmnl)
  - hosts/strong.md: updated At-a-glance to reflect 7 LXCs hosted
  - containers/123-claudio-bot.md, 127-mule-photos-new.md: archived to
    containers/archive/ (were destroyed LXCs with living pages)
  - inventory.yaml: verified correct — no changes needed

Phase 2 — structural cleanup
  - infrastructure/index.md: one-page overview of all cross-cutting systems
  - runbooks/: moved runbook-budget-from-csv.md and runbook-dpkg-interrupted.md
    from operations/ with YAML frontmatter added
  - plans/done/: moved 4 completed plans out of active view; updated index
  - vms/index.md: added VM index page

Phase 3 — navigation & discoverability
  - GLOSSARY.md: term definitions (Authentik, Caddy, LXC, VAAPI, etc.)
  - README: added table of contents, links to glossary + infrastructure index
  - investigations/: archived 2 resolved cases (crash-loop, authentik-migration)
    to investigations/archive/; updated index with active vs archived sections

Phase 4 — ongoing discipline
  - CONTRIBUTING.md: documented same-session update rule with explicit checklist
  - README: replaced full LXC table with summary + link to containers/index.md
    (single source of truth; de-duplication)

investigations/index.md

@@ -2,14 +2,23 @@
 
 Time-stamped incident reports and experiments. One entry per incident; the entry is the canonical source. Per-node changelog entries link back here.
 
-## Index
+## Active / recent
 
 | Date         | Title                                                              | Status        |
 | ------------ | ------------------------------------------------------------------ | ------------- |
-|| 2026-06-06   | [Frequent Authentik login prompts — session lifetime fix](2026-06-06-authentik-session-lifetime.md) | Resolved — `session_duration=days=30`, `SESSION_COOKIE_AGE=30d` |
-|| 2026-05-31   | [Authentik migrated from LXC 124 to the VPS](2026-05-31-authentik-vps-migration.md) | Resolved; LXC 124 Authentik in ~2-week dual-run before decommission |
+| 2026-06-06   | [Caddyfile truncation incident](2026-06-06-caddyfile-truncation.md) | Resolved — permanent safeguards deployed (site-count guard, auto-stash, auto-backup) |
+| 2026-06-06   | [Frequent Authentik login prompts — session lifetime fix](2026-06-06-authentik-session-lifetime.md) | Resolved — `session_duration=days=30`, `SESSION_COOKIE_AGE=30d` |
 | 2026-06-03   | [Moonlight/Sunshine streaming — WiFi jitter](2026-06-03-moonlight-sunshine-wifi-jitter.md) | Mitigations applied; definitive fix requires wiring mac-mini via Ethernet |
-| 2026-04-21   | [Hubris crash loop — thermal + USB drive](2026-04-21-hubris-crash-loop.md) | Drive removal A/B test passing as of 2026-04-28 (3+ days uptime) |
+| 2026-06-01   | [Mac-mini onboarding](2026-06-01-mac-mini-onboarding.md) | Onboarded |
+
+## Resolved (archived)
+
+See [`archive/`](archive/):
+
+| Date         | Title                                                              |
+| ------------ | ------------------------------------------------------------------ |
+| 2026-04-21   | [Hubris crash loop — thermal + USB drive](archive/2026-04-21-hubris-crash-loop.md) |
+| 2026-05-31   | [Authentik migrated from LXC 124 to the VPS](archive/2026-05-31-authentik-vps-migration.md) |
 
 ## Conventions
 
@@ -17,3 +26,4 @@ Time-stamped incident reports and experiments. One entry per incident; the entry
 - Mandatory sections: Summary, Timeline, Root cause, Mitigations applied, Open questions.
 - Update the entry as the situation evolves; never rewrite history. Add new dated sections at the bottom.
 - Link back from every node's changelog that's affected.
+- Move to `archive/` when the incident is fully resolved and no longer actively referenced.