feat(08-01): update format.rs for v1.1 TOC entry layout

- Bump VERSION constant from 1 to 2
- Add entry_type (u8) and permissions (u16) fields to TocEntry struct
- Update write_toc_entry/read_toc_entry for new field order after name
- Update entry_size formula from 101 to 104 + name_length
- Update all unit tests for v1.1 layout (new fields, version 2, sizes)
- Add placeholder entry_type/permissions to archive.rs ProcessedFile for compilation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/archive.rs

@@ -12,6 +12,8 @@ use crate::key::KEY;
 /// Processed file data collected during Pass 1 of pack.
 struct ProcessedFile {
     name: String,
+    entry_type: u8,    // 0x00 = file, 0x01 = directory
+    permissions: u16,   // Lower 12 bits of POSIX mode_t
     original_size: u32,
     compressed_size: u32,
     encrypted_size: u32,
@@ -114,6 +116,8 @@ pub fn pack(files: &[PathBuf], output: &Path, no_compress: &[String]) -> anyhow:
 
         processed.push(ProcessedFile {
             name,
+            entry_type: 0,
+            permissions: 0o644,
             original_size,
             compressed_size,
             encrypted_size,
@@ -142,6 +146,8 @@ pub fn pack(files: &[PathBuf], output: &Path, no_compress: &[String]) -> anyhow:
         .iter()
         .map(|pf| TocEntry {
             name: pf.name.clone(),
+            entry_type: pf.entry_type,
+            permissions: pf.permissions,
             original_size: pf.original_size,
             compressed_size: pf.compressed_size,
             encrypted_size: pf.encrypted_size,
@@ -179,6 +185,8 @@ pub fn pack(files: &[PathBuf], output: &Path, no_compress: &[String]) -> anyhow:
         .enumerate()
         .map(|(i, pf)| TocEntry {
             name: pf.name.clone(),
+            entry_type: pf.entry_type,
+            permissions: pf.permissions,
             original_size: pf.original_size,
             compressed_size: pf.compressed_size,
             encrypted_size: pf.encrypted_size,