feat: build system transition to release fork + archive hardening

Release fork infrastructure:
- REDBEAR_RELEASE=0.1.1 with offline enforcement (fetch/distclean/unfetch blocked)
- 195 BLAKE3-verified source archives in standard format
- Atomic provisioning via provision-release.sh (staging + .complete sentry)
- 5-phase improvement plan: restore format auto-detection, source tree
  validation (validate-source-trees.py), archive-map.json, REPO_BINARY fallback

Archive normalization:
- Removed 87 duplicate/unversioned archives from shared pool
- Regenerated all archives in consistent format with source/ + recipe.toml
- BLAKE3SUMS and manifest.json generated from stable tarball set

Patch management:
- verify-patches.sh: pre-sync dry-run report (OK/REVERSED/CONFLICT)
- 121 upstream-absorbed patches moved to absorbed/ directories
- 43 active patches verified clean against rebased sources
- Stress test: base updated to upstream HEAD, relibc reset and patched

Compilation fixes:
- relibc: Vec imports in redox-rt (proc.rs, lib.rs, sys.rs)
- relibc: unsafe from_raw_parts in mod.rs (2024 edition)
- fetch.rs: rev comparison handles short/full hash prefixes
- kibi recipe: corrected rev mismatch

New scripts: restore-sources.sh, provision-release.sh, verify-sources-archived.sh,
check-upstream-releases.sh, validate-source-trees.py, verify-patches.sh,
repair-archive-format.sh, generate-manifest.py

Documentation: AGENTS.md, README.md, local/AGENTS.md updated for release fork model

local/patches/base/P2-initfs-pcid-service.patch

@@ -1,45 +0,0 @@
-diff --git a/init.initfs.d/40_pcid.service b/init.initfs.d/40_pcid.service
-new file mode 100644
---- /dev/null
-+++ b/init.initfs.d/40_pcid.service
-@@ -0,0 +1,7 @@
-+[unit]
-+description = "PCI daemon"
-+requires_weak = ["41_acpid.service"]
-+
-+[service]
-+cmd = "pcid"
-+type = "notify"
-diff --git a/init.initfs.d/40_drivers.target b/init.initfs.d/40_drivers.target
---- a/init.initfs.d/40_drivers.target
-+++ b/init.initfs.d/40_drivers.target
-@@ -3,6 +3,7 @@ description = "Initfs drivers"
- requires_weak = [
-     "10_lived.service",
-     "20_graphics.target",
-+    "40_pcid.service",
-     "40_ps2d.service",
-     "40_bcm2835-sdhcid.service",
-     "40_hwd.service",
-diff --git a/init.initfs.d/40_hwd.service b/init.initfs.d/40_hwd.service
---- a/init.initfs.d/40_hwd.service
-+++ b/init.initfs.d/40_hwd.service
-@@ -1,6 +1,6 @@
- [unit]
- description = "Hardware manager"
--requires_weak = ["10_inputd.service", "10_lived.service", "20_graphics.target", "41_acpid.service"]
-+requires_weak = ["10_inputd.service", "10_lived.service", "20_graphics.target", "40_pcid.service", "41_acpid.service"]
- 
- [service]
- cmd = "hwd"
-diff --git a/init.initfs.d/40_pcid-spawner-initfs.service b/init.initfs.d/40_pcid-spawner-initfs.service
---- a/init.initfs.d/40_pcid-spawner-initfs.service
-+++ b/init.initfs.d/40_pcid-spawner-initfs.service
-@@ -1,6 +1,6 @@
- [unit]
- description = "PCI driver spawner"
--requires_weak = ["10_inputd.service", "20_graphics.target", "40_hwd.service"]
-+requires_weak = ["10_inputd.service", "20_graphics.target", "40_pcid.service"]
- 
- [service]
- cmd = "pcid-spawner"