feat: Phase 1.5 — health prober, Oracle's Memory, off-thread EPG, PWA

Resilience + scale pass on top of the v1 core.

Stream health prober:
- New SSRF-validated /probe endpoint (HEAD -> ranged-GET fallback, 6s timeout,
  5-min TTL cache, concurrency-capped, no-store) + orb_probe_total metrics
- Front-end health.js: lazy bounded-concurrency probing (current + sampled
  channels, not the whole catalog), LIVE/DEGRADED/DEAD scoring, guide skull
  glyph, instant no-signal on zap to a known-dead channel

Oracle's Memory (memory.js):
- Session resurrection (last channel, volume, mute, theater/dim/ambient)
- Exponential-decay per-channel uptime history; pinning; dead-channel auto-skip

Off-thread XMLTV:
- lib/xmltv-parse.js (pure, hand-rolled scanner, no DOMParser/regex backtracking)
  run in epg-worker.js module worker; wired into the iptv-org provider
- Unit-tested in node: entity decode, TZ offsets, 20k programmes off-thread

Service worker / PWA:
- manifest.webmanifest + orb icons; sw.js (cache-first shell + hls.js,
  stale-while-revalidate for JSON-over-relay, never caches streams)
- CSP gains worker-src + manifest-src; relay sends no-store on /relay + /probe
  so the SW is the sole metadata freshness authority; webmanifest MIME fix

Docs: README de-emojified (title only) and reframed as a peer parallel build.

Verified: SSRF probes blocked, legit probe + cache, new headers present,
PWA assets served, parser tests 8/8, JS syntax clean, zero Rust warnings.

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

README.md

@@ -23,18 +23,18 @@ It is built around one idea: **a channel is "a named thing on a guide that resol
 
 > **"Purple team"** here is a security *identity* (red offense + blue defense), not a color. The palette stays red/black; the wizard theme is naming and lore on top of clear, accessible function.
 
-This is a side project built side-by-side with a mentor's reference design (a NAS + ErsatzTV + Raspberry Pi feeding a physical CRT). Same premise — *your media as 24/7 TV channels* — different architecture: portable, browser-based, and security-first.
+It is developed as a parallel build to a peer project that takes the same premise — *your media as 24/7 TV channels* — through a different architecture (a NAS + ErsatzTV + Raspberry Pi feeding a physical CRT). This implementation is portable, browser-based, and security-first.
 
 ## Features
 
-- 📺 **Authentic CRT presentation** — phosphor glow, scanlines, screen curvature, vignette breathing (all CSS, no WebGL).
-- 🔢 **Cable-box channel zapping** — number entry with debounce + 7-segment OSD, channel up/down, last-channel toggle, auto-fading now-playing banner.
-- 📡 **"Scrying Static" transitions** — procedural channel-change noise that clears the moment the new stream buffers (reduced-motion aware).
-- 🗓️ **The Almanac** — a virtualized, 1994-style scrolling TV guide with now/next, a live current-time playhead, and keyboard navigation. Scales to tens of thousands of channels.
-- 🎬 **Immersion stack** — Theater, Dim, and Ambient-backlight modes (à la YouTube), composable and keyboard-driven.
-- 🌫️ **Graceful dead-stream handling** — "the orb clouds over" no-signal card, automatic fallback URLs, and auto-skip.
-- 🧙 **The Lexicon** — optional in-world vocabulary (guide → *The Almanac*, search → *Scry*) with a one-click "mundane mode"; screen-reader labels always stay plain-English.
-- ♿ **Accessible by default** — full keyboard map + help overlay, ARIA roles/live regions, visible focus rings, and a complete `prefers-reduced-motion` kill-switch.
+- **Authentic CRT presentation** — phosphor glow, scanlines, screen curvature, vignette breathing (all CSS, no WebGL).
+- **Cable-box channel zapping** — number entry with debounce + 7-segment OSD, channel up/down, last-channel toggle, auto-fading now-playing banner.
+- **"Scrying Static" transitions** — procedural channel-change noise that clears the moment the new stream buffers (reduced-motion aware).
+- **The Almanac** — a virtualized, 1994-style scrolling TV guide with now/next, a live current-time playhead, and keyboard navigation. Scales to tens of thousands of channels.
+- **Immersion stack** — Theater, Dim, and Ambient-backlight modes (à la YouTube), composable and keyboard-driven.
+- **Graceful dead-stream handling** — "the orb clouds over" no-signal card, automatic fallback URLs, and auto-skip.
+- **The Lexicon** — optional in-world vocabulary (guide → *The Almanac*, search → *Scry*) with a one-click "mundane mode"; screen-reader labels always stay plain-English.
+- **Accessible by default** — full keyboard map + help overlay, ARIA roles/live regions, visible focus rings, and a complete `prefers-reduced-motion` kill-switch.
 
 ## Security posture
 
@@ -150,8 +150,8 @@ This project does **not** host, store, or transmit any media. It indexes **publi
 
 ## Acknowledgments
 
-- Inspired by a mentor's NAS → CRT "your movies as 24/7 channels" build.
-- Channel data and the public stream index come from the excellent [iptv-org](https://github.com/iptv-org/iptv) community project.
+- Developed as a parallel exploration alongside a peer's NAS-to-CRT "media as 24/7 channels" project.
+- Channel data and the public stream index come from the [iptv-org](https://github.com/iptv-org/iptv) community project.
 
 ## License