fix(standalone): decouple evidence paths and harden gate scripts

Switch acceptance/fault/release scripts to project-local .sisyphus evidence roots and remove parent-repo path assumptions.

Also harden deterministic behavior with run-id-derived port allocation and tuned fault thresholds so release gate pass and injected-failure flows remain stable in standalone execution.

README.md

@@ -34,13 +34,13 @@ sudo pacman -S cmake gstreamer gst-plugins-base gst-plugins-good \
 ### Build
 
 ```bash
-cmake -B downstream/cvmmap-streamer/build -S downstream/cvmmap-streamer
-cmake --build downstream/cvmmap-streamer/build
+cmake -B build -S .
+cmake --build build
 ```
 
 **Verify binaries exist:**
 ```bash
-ls -la downstream/cvmmap-streamer/build/{cvmmap_sim,cvmmap_streamer,rtp_receiver_tester,rtmp_stub_tester}
+ls -la build/{cvmmap_sim,cvmmap_streamer,rtp_receiver_tester,rtmp_stub_tester}
 ```
 
 ### Mandatory Acceptance (Standalone)
@@ -48,7 +48,6 @@ ls -la downstream/cvmmap-streamer/build/{cvmmap_sim,cvmmap_streamer,rtp_receiver
 Run the full mandatory acceptance suite. This executes the complete protocol/codec matrix without requiring external servers.
 
 ```bash
-cd downstream/cvmmap-streamer
 ./scripts/acceptance_standalone.sh
 ```
 
@@ -66,7 +65,6 @@ cd downstream/cvmmap-streamer
 Run the fault injection and latency validation suite.
 
 ```bash
-cd downstream/cvmmap-streamer
 ./scripts/fault_suite.sh
 ```
 
@@ -242,7 +240,7 @@ Always use `downstream/cvmmap-streamer/build` for the build directory. Using the
 ### Fresh Configure
 If you encounter configure errors referencing sibling repo paths, run:
 ```bash
-cmake --fresh -B downstream/cvmmap-streamer/build -S downstream/cvmmap-streamer
+cmake --fresh -B build -S .
 ```
 
 ## Optional Server Smoke Tests
@@ -257,7 +255,7 @@ If the server environment is unavailable, these tests should be skipped without
 ## Project Structure
 
 ```
-downstream/cvmmap-streamer/
+cvmmap-streamer/
 ├── CMakeLists.txt          # Build configuration
 ├── README.md               # This file
 ├── docs/
@@ -314,6 +312,6 @@ Each run creates timestamped subdirectories with full logs for every matrix row
 ## References
 
 - [Enhanced RTMP Specification](https://github.com/veovera/enhanced-rtmp)
-- [cv-mmap IPC Contract](../../docs/cvmmap.ksy)
+- [cv-mmap IPC Contract](https://github.com/k2wanko/cv-mmap/blob/main/docs/cvmmap.ksy)
 - SRS Documentation: https://ossrs.io/lts/en-us/docs/v7/doc/rtmp
 - ZLMediaKit: https://github.com/ZLMediaKit/ZLMediaKit