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/absorbed/P0-ihdgd-intel-gpu-ids.patch

@@ -0,0 +1,31 @@
+diff --git a/drivers/graphics/ihdgd/config.toml b/drivers/graphics/ihdgd/config.toml
+index acbb4e78..210731ae 100644
+--- a/drivers/graphics/ihdgd/config.toml
++++ b/drivers/graphics/ihdgd/config.toml
+@@ -51,5 +51,26 @@ ids = { 0x8086 = [
+     0x56B3, # Pro A60
+     0x56C0, # GPU Flex 170
+     0x56C1, # GPU Flex 140
++    # Alder Lake-S Desktop
++    0x4680, 0x4682, 0x4688, 0x468A, 0x468B,
++    0x4690, 0x4692, 0x4693,
++    # Alder Lake-P Mobile
++    0x46A0, 0x46A1, 0x46A2, 0x46A3, 0x46A6,
++    0x46A8, 0x46AA, 0x462A, 0x4626, 0x4628,
++    0x46B0, 0x46B1, 0x46B2, 0x46B3,
++    0x46C0, 0x46C1, 0x46C2, 0x46C3,
++    # Alder Lake-N Low-Power
++    0x46D0, 0x46D1, 0x46D2, 0x46D3, 0x46D4,
++    # Raptor Lake-S Desktop
++    0xA780, 0xA781, 0xA782, 0xA783,
++    0xA788, 0xA789, 0xA78A, 0xA78B,
++    # Raptor Lake-P Mobile
++    0xA720, 0xA7A0, 0xA7A8, 0xA7AA, 0xA7AB,
++    # Raptor Lake-U Mobile
++    0xA721, 0xA7A1, 0xA7A9, 0xA7AC, 0xA7AD,
++    # Meteor Lake
++    0x7D40, 0x7D45, 0x7D55, 0x7D60, 0x7DD5,
++    # Arrow Lake-H
++    0x7D51, 0x7DD1,
+ ] }
+ command = ["ihdgd"]