Rename .pi to .feynman, rename citation agent to verifier, add website, skills, and docs

- Rename project config dir from .pi/ to .feynman/ (Pi supports this via piConfig.configDir)
- Rename citation agent to verifier across all prompts, agents, skills, and docs
- Add website with homepage and 24 doc pages (Astro + Tailwind)
- Add skills for all workflows (deep-research, lit, review, audit, replicate, compare, draft, autoresearch, watch, jobs, session-log, agentcomputer)
- Add Pi-native prompt frontmatter (args, section, topLevelCli) and read at runtime
- Remove sync-docs generation layer — docs are standalone
- Remove metadata/prompts.mjs and metadata/packages.mjs — not needed at runtime
- Rewrite README and homepage copy
- Add environment selection to /replicate before executing
- Add prompts/delegate.md and AGENTS.md

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

extensions/research-tools/header.ts

@@ -106,7 +106,7 @@ async function buildAgentCatalogSummary(): Promise<{ agents: string[]; chains: s
 	const agents: string[] = [];
 	const chains: string[] = [];
 	try {
-		const entries = await readdir(resolvePath(APP_ROOT, ".pi", "agents"), { withFileTypes: true });
+		const entries = await readdir(resolvePath(APP_ROOT, ".feynman", "agents"), { withFileTypes: true });
 		for (const entry of entries) {
 			if (!entry.isFile() || !entry.name.endsWith(".md")) continue;
 			if (entry.name.endsWith(".chain.md")) {
@@ -243,9 +243,13 @@ export function installFeynmanHeader(
 					pushList("Chains", agentData.chains);
 
 					if (activity) {
+						const maxActivityLen = leftW * 2;
+						const trimmed = activity.length > maxActivityLen
+							? `${activity.slice(0, maxActivityLen - 1)}…`
+							: activity;
 						leftLines.push("");
 						leftLines.push(theme.fg("accent", theme.bold("Last Activity")));
-						for (const line of wrapWords(activity, leftW)) {
+						for (const line of wrapWords(trimmed, leftW)) {
 							leftLines.push(theme.fg("dim", line));
 						}
 					}