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-misc-daemon-fixes.patch

@@ -1,30 +0,0 @@
-# P2-misc-daemon-fixes.patch
-#
-# Various daemon error handling and robustness fixes:
-# graceful degradation when audio hardware is absent,
-# zerod argument handling and request loop resilience.
-#
-# Covers:
-#   - audiod/main.rs: handle ENODEV when no audio hardware present
-#   - zerod/main.rs: derive Copy for Ty, graceful argument parsing, resilient request loop
-#
-diff --git a/audiod/src/main.rs b/audiod/src/main.rs
-index 51b103af..2354cf5f 100644
---- a/audiod/src/main.rs
-+++ b/audiod/src/main.rs
-@@ -48,7 +48,14 @@ fn daemon(daemon: SchemeDaemon) -> anyhow::Result<()> {
- 
-     let pid = libredox::call::getpid()?;
- 
--    let hw_file = Fd::open("/scheme/audiohw", flag::O_WRONLY | flag::O_CLOEXEC, 0)?;
-+    let hw_file = match Fd::open("/scheme/audiohw", flag::O_WRONLY | flag::O_CLOEXEC, 0) {
-+        Ok(fd) => fd,
-+        Err(err) if err.errno() == syscall::ENODEV => {
-+            eprintln!("audiod: no audio hardware detected");
-+            return Ok(());
-+        }
-+        Err(err) => return Err(err).context("failed to open /scheme/audiohw"),
-+    };
- 
-     let socket = Socket::create().context("failed to create scheme")?;
-