Extend cache hashing to cover config file and template file contents

[Copilot]

The transform and output caches only hashed input file content and variable values — changes to the config file structure or template files were invisible to the cache, causing stale outputs to be served.

Changes

src/cache.rs

• compute_input_hash: Added config_content: &str parameter — raw config YAML bytes are now mixed into the transform cache key, so any config change (not just variables) triggers a cache miss
• compute_output_hash: Added template_content: Option<&str> parameter — actual template file bytes are now part of the output hash, so editing a template invalidates its cached render even when the path is unchanged

src/commands/build.rs

• Reads raw config file content at hash time (post-parse) and passes it to compute_input_hash
• Reads each output's template file content before calling compute_output_hash; logs a WARN if the file is unreadable so cache degradation is visible

// Before — only input content + variables
let base_input_hash = compute_input_hash(&normalized_content, &config.variables);
let output_hash = compute_output_hash(&transformed, &format_str, output.template.as_deref());

// After — config content and template bytes included
let base_input_hash = compute_input_hash(&normalized_content, &config_content, &config.variables);
let output_hash = compute_output_hash(&transformed, &format_str, output.template.as_deref(), template_content.as_deref());

Tests

• All existing callers updated for new signatures ("" / None for the new params preserves prior behavior)
• New unit tests: test_different_config_content_produces_different_hash, test_output_hash_different_template_content_differs, test_cache_miss_when_config_changed

[devactivity-app]

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