feat(directory-templates): concept-profile template + {{basename}} token + in-body provenance line

Three landings:

1. New {{basename}} interpolation token. Resolves strictly to the target
   file's basename without .md, never falling through to a frontmatter
   `title` field. Concept-profile uses this so the H1 always matches the
   filename in the vault, regardless of what the frontmatter says.

2. New seed template src/docs/templates/concept-profile.md (matched in the
   user's vault at zz-cf-lib/templates/concept-profile.md). applies-to-paths
   is "concepts/**". Heading skeleton:
     - Defining and Describing {{basename}} (image placeholder bullet,
       optional mermaid diagram, italic lede, 2–4 sentence paragraph)
     - Uses in Context
     - History of Use (Origins, Evolution)
     - Best Real-World Examples
     - Case Studies
   search-recency is "year" rather than "month" since concepts evolve more
   slowly than products.

3. In-body provenance line inside the # Sources footer:
     _Generated <ISO timestamp> via <Provider> <model id>._
   Always renders, even when the run returned zero sources (in which case
   the body becomes "_No sources returned._"). Mirrors and complements the
   frontmatter stamp; gives readers an at-a-glance record of which model
   produced a given file and when, without needing to inspect frontmatter.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/docs/templates/concept-profile.md

@@ -0,0 +1,64 @@
+---
+title: Concept Profile (Idea / Pattern / Mental Model)
+applies-to-paths:
+  - "concepts/**"
+description: Generates an encyclopedia-style entry for a concept — definition, usage, history, examples, case studies.
+---
+
+# About this template
+
+Use this for files under `concepts/` whose body is empty or near-empty. The bullets under each heading are *instructions to the model*, not literal output. The model fills each section based on those instructions.
+
+The H1 heading uses `{{basename}}` (strict filename, never the frontmatter `title` field) so the rendered heading always matches the file name in the vault.
+
+```cft
+provider: perplexity
+model: sonar-deep-research
+search-recency: year
+return-citations: true
+return-images: false
+system: |
+  You are a research analyst writing an encyclopedia-style entry for the
+  concept named "{{basename}}". Use Perplexity's web search aggressively for
+  every section. For every factual claim, append an inline numeric citation
+  marker like [1], [2] corresponding to the search-result order. Quote
+  phrasing from primary sources where useful. Prefer first-party sources,
+  academic literature, books, and reputable industry analysis. Use the
+  entity's existing metadata as starting context.
+```
+
+# Defining and Describing {{basename}}
+- Insert this exact placeholder line on its own bullet so the user can replace it after generation: `[Image embed placeholder — run "Find images for selection" on this section to populate.]`
+- If this concept involves a process, hierarchy, taxonomy, or part-relationship that a diagram clarifies, render a `mermaid` codefence here. If a diagram does not add insight, omit it entirely — do not force one.
+- Write a one-sentence italicized lede (a zinger or kicker) that captures the core insight in plain language. Use markdown italics: `_..._`.
+- Then write a 2–4 sentence paragraph giving more context: what the concept is, when it applies, and why it matters.
+
+# Uses in Context
+- 3–6 bullets describing how the concept is invoked — typically in business, technology, design, or popular culture — to describe something or convey meaning.
+- Quote phrasing from sources where they invoke the term inline. Cite each.
+
+# History of Use
+
+## Origins
+- Where the term first appeared (academic paper, book, blog post, industry report).
+- Who introduced it and in what context.
+- One concise paragraph or 2–4 cited bullets, whichever fits.
+
+## Evolution
+- 2–3 inflection points where the concept was adapted, redefined, or expanded.
+- Dated bullets, oldest first. Cite each.
+
+# Best Real-World Examples
+- 5–7 one-line bullets, each naming a service, product, organization, or research finding that exemplifies the concept.
+- Use `[Name](url)` form for the entity name in each bullet.
+
+# Case Studies
+- 2–3 paragraph-length narratives going deeper than the Examples bullets above.
+- Each case study explains: who, when, what they did, what changed, what it shows about the concept.
+- Cite each factual claim.
+
+***
+
+# User Notes
+
+Anything below the `***` line is excluded from the request. Use this zone for tuning notes, prior outputs, or examples while iterating on the template.

src/services/directoryTemplateService.ts

@@ -61,8 +61,11 @@ function wrapThinkBlocks(text: string): string {
     });
 }
 
-function buildSourcesFooter(sources: PerplexitySource[]): string {
-    if (!sources.length) return '';
+function buildSourcesFooter(
+    sources: PerplexitySource[],
+    runTimestamp: string,
+    runModelLabel: string,
+): string {
     // Canonical Lossless reference-section format per
     // cite-wide/context-v/reminders/Lossless-Citation-Spec.md:
     //   "always use a `: ` after the citation identifier".
@@ -71,14 +74,21 @@ function buildSourcesFooter(sources: PerplexitySource[]): string {
     // form matches the spec, so emit it.
     //
     // Footer shape: blank line before the `***` separator, blank line between
-    // the separator and the `# Sources` h1, blank line before the references.
-    const lines = sources.map((s, i) => {
+    // the separator and the `# Sources` h1, blank line before the provenance
+    // line, blank line before the references. Provenance always renders, even
+    // when no sources came back, so the file always carries an in-body record
+    // of which model produced it and when.
+    const provenanceLine = `_Generated ${runTimestamp} via ${runModelLabel}._`;
+    const sourceLines = sources.map((s, i) => {
         const n = i + 1;
         const title = (typeof s.title === 'string' && s.title) ? s.title : (s.url ?? 'Source');
         const url = s.url ?? '';
         return url ? `[${n.toString()}]: [${title}](${url})` : `[${n.toString()}]: ${title}`;
     });
-    return '\n\n***\n\n# Sources\n\n' + lines.join('\n') + '\n';
+    const body = sourceLines.length > 0
+        ? `${provenanceLine}\n\n${sourceLines.join('\n')}`
+        : `${provenanceLine}\n\n_No sources returned._`;
+    return '\n\n***\n\n# Sources\n\n' + body + '\n';
 }
 
 const FRONTMATTER_FENCE = '---';
@@ -229,6 +239,7 @@ export interface InterpolationContext {
     title: string;
     frontmatter: string;
     frontmatterObj: Record<string, unknown>;
+    basename: string;
 }
 
 export function interpolate(text: string, ctx: InterpolationContext): string {
@@ -236,6 +247,7 @@ export function interpolate(text: string, ctx: InterpolationContext): string {
         if (key === 'title') return ctx.title;
         if (key === 'frontmatter') return ctx.frontmatter;
         if (key === 'today') return new Date().toISOString().slice(0, 10);
+        if (key === 'basename') return ctx.basename;
         const fmKey = key.startsWith('frontmatter.') ? key.slice('frontmatter.'.length) : key;
         if (fmKey in ctx.frontmatterObj) {
             return frontmatterValueToString(ctx.frontmatterObj[fmKey]);
@@ -422,7 +434,12 @@ export async function applyTemplate(
     const title = typeof fm.title === 'string' ? fm.title : target.basename;
     const fmYaml = buildFrontmatterPayload(fm, settings.frontmatterWhitelist);
 
-    const ctx: InterpolationContext = { title, frontmatter: fmYaml, frontmatterObj: fm };
+    const ctx: InterpolationContext = {
+        title,
+        frontmatter: fmYaml,
+        frontmatterObj: fm,
+        basename: target.basename,
+    };
     const templateSystem = interpolate(template.cftSystem, ctx);
     const interpolatedSkeleton = interpolate(template.userSkeleton, ctx);
 
@@ -462,17 +479,8 @@ export async function applyTemplate(
             isCancelled,
         );
 
-        // Post-write cleanup: wrap <think> blocks, append sources footer.
-        const trimmedStreamed = streamed.replace(/^\s+/, '').replace(/\s+$/, '');
-        const cleanedStreamed = wrapThinkBlocks(trimmedStreamed);
-        const sourcesFooter = buildSourcesFooter(sources);
-        const finalContent = `${initialContent}${cleanedStreamed}\n${sourcesFooter}`;
-        await app.vault.modify(target, finalContent);
-
-        // Stamp run metadata in the target's frontmatter so files can be
-        // queried for staleness ("which Tooling/ entries were last refreshed
-        // before <date>?"). Uses fileManager.processFrontMatter so other
-        // frontmatter keys remain byte-identical apart from these two.
+        // Compute run metadata once: used both in the in-body provenance line
+        // (inside the # Sources footer) and the frontmatter stamp.
         const provider = typeof template.cftConfig['provider'] === 'string'
             ? template.cftConfig['provider']
             : 'unknown';
@@ -484,6 +492,19 @@ export async function applyTemplate(
             : provider;
         const runTimestamp = new Date().toISOString();
         const runModelLabel = `${providerLabel} ${modelName}`.trim();
+
+        // Post-write cleanup: wrap <think> blocks, append sources footer with
+        // provenance line.
+        const trimmedStreamed = streamed.replace(/^\s+/, '').replace(/\s+$/, '');
+        const cleanedStreamed = wrapThinkBlocks(trimmedStreamed);
+        const sourcesFooter = buildSourcesFooter(sources, runTimestamp, runModelLabel);
+        const finalContent = `${initialContent}${cleanedStreamed}\n${sourcesFooter}`;
+        await app.vault.modify(target, finalContent);
+
+        // Stamp run metadata in the target's frontmatter so files can be
+        // queried for staleness ("which Tooling/ entries were last refreshed
+        // before <date>?"). Uses fileManager.processFrontMatter so other
+        // frontmatter keys remain byte-identical apart from these two.
         await app.fileManager.processFrontMatter(target, (fm: Record<string, unknown>) => {
             fm['cf_last_run'] = runTimestamp;
             fm['cf_last_run_model'] = runModelLabel;