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-hwd-misc.patch

@@ -1,18 +0,0 @@
-# P2-hwd-misc.patch
-# Keep hwd focused on hardware probing. Init owns boot-time pcid startup.
-
-diff --git a/drivers/hwd/src/main.rs b/drivers/hwd/src/main.rs
-index 79360e34..4de3d9f3 100644
---- a/drivers/hwd/src/main.rs
-+++ b/drivers/hwd/src/main.rs
-@@ -37,11 +37,6 @@ fn daemon(daemon: daemon::Daemon) -> ! {
- 
-     //TODO: launch pcid based on backend information?
-     // Must launch after acpid but before probe calls /scheme/acpi/symbols
--    #[allow(deprecated, reason = "we can't yet move this to init")]
--    daemon::Daemon::spawn(process::Command::new("pcid"));
--
-     daemon.ready();
- 
-     //TODO: HWD is meant to locate PCI/XHCI/etc devices in ACPI and DeviceTree definitions and start their drivers
-