Function session_memory_digest

src/hooks/memory_inject.rs:376–387

Builds the session-start memory digest for `root`, or `None` when injection is disabled, the project has no initialized store, or no injectable facts exist. When `session_id` is present the injected fact ids are recorded so per-prompt recall does not repeat them.

(root: &Path, session_id: Option<&str>)

/// injectable facts exist. When `session_id` is present the injected fact ids
/// are recorded so per-prompt recall does not repeat them.
pub async fn session_memory_digest(root: &Path, session_id: Option<&str>) -> Option<String> {
    if !memory_injection_enabled() {
        return None;
    }
    if !crate::tracedecay::TraceDecay::has_initialized_store(root).await {
        return None;
    }
    let facts = select_digest_facts(digest_candidates(root).await, SESSION_DIGEST_FACT_COUNT);
    let (text, included) = render_fact_block(DIGEST_HEADER, &facts, SESSION_DIGEST_CHAR_BUDGET)?;
    record_injected_facts(root, session_id, &included);
    Some(text)
}

/// Builds a prompt-relevance-gated recall block for a `UserPromptSubmit`-style
/// event, or `None` when injection is disabled, the prompt is trivial, or no