M3.8: fix merge — unsupported-raw preview probe carries embedded XMP; AGENTS.md per-agent ports/scratch

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

AGENTS.md

@@ -44,7 +44,7 @@ and often so a crash loses minutes, not hours.
 - Export goes through `lightcraft_engine::export` (one encoder for app, CLI, MCP and web); UI-only commands live in
   `crates/ui-egui/src/menus.rs`.
 - Shell gotcha: `mv`/`cp` are aliased interactive here — use `/bin/mv -f` / `/bin/cp -f`.
-- Parallel agents: separate git worktrees and `CARGO_TARGET_DIR=target/agent-<name>`; keep every `Cargo.toml` valid at all times (the `crates/*` glob means one broken manifest breaks everyone).
+- Parallel agents: separate git worktrees and `CARGO_TARGET_DIR=target/agent-<name>`; each agent uses its **own control port** (pick one in 18000–19999, never the default 7980) and its own scratch subfolder (`<scratch>/<agent-name>/`) — never `rm -rf` shared paths; delete your target dir when done (disk is shared); keep every `Cargo.toml` valid at all times (the `crates/*` glob means one broken manifest breaks everyone).
 - Test corpora: `cargo xtask corpus --download` into `corpus/` (gitignored, CC0 only). Never commit media.
 
 ## Testing & performance (do this often)

CLAUDE.md

@@ -44,7 +44,7 @@ and often so a crash loses minutes, not hours.
 - Export goes through `lightcraft_engine::export` (one encoder for app, CLI, MCP and web); UI-only commands live in
   `crates/ui-egui/src/menus.rs`.
 - Shell gotcha: `mv`/`cp` are aliased interactive here — use `/bin/mv -f` / `/bin/cp -f`.
-- Parallel agents: separate git worktrees and `CARGO_TARGET_DIR=target/agent-<name>`; keep every `Cargo.toml` valid at all times (the `crates/*` glob means one broken manifest breaks everyone).
+- Parallel agents: separate git worktrees and `CARGO_TARGET_DIR=target/agent-<name>`; each agent uses its **own control port** (pick one in 18000–19999, never the default 7980) and its own scratch subfolder (`<scratch>/<agent-name>/`) — never `rm -rf` shared paths; delete your target dir when done (disk is shared); keep every `Cargo.toml` valid at all times (the `crates/*` glob means one broken manifest breaks everyone).
 - Test corpora: `cargo xtask corpus --download` into `corpus/` (gitignored, CC0 only). Never commit media.
 
 ## Testing & performance (do this often)

crates/engine/src/files.rs

@@ -59,6 +59,7 @@ pub fn probe_bytes(name: &str, bytes: &[u8]) -> Result<ProbeInfo, String> {
                     meta,
                     as_shot_wb: None,
                     content_hash,
+                    xmp: lightcraft_meta::embedded(bytes).xmp,
                 });
             }
             Err(e) => return Err(e.to_string()),