fix: address review findings on formula templates and BOOTSTRAP docs

- upgrade-dependency.toml: fix forge upgrade command (forge update, not
  forge install); remove redundant `npm install` after lockfile write;
  simplify description to "Upgrade {{package}} to {{to_version}}" so it
  reads cleanly when from_version is omitted
- add-rpc-method.toml: remove dead `namespace` variable; inline namespace
  derivation logic into register-method step description
- BOOTSTRAP.md: mark formula label entry as requiring feat/formula merge;
  add YAML front matter example so operators know the issue schema

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

formulas/add-rpc-method.toml

@@ -18,11 +18,6 @@ description = "Return type description (e.g. 'U256 balance', 'Vec<Position>')"
 required    = false
 default     = "result"
 
-[vars.namespace]
-description = "RPC namespace prefix (e.g. eth, harb, net) — derived from method_name if omitted"
-required    = false
-default     = ""
-
 [[steps]]
 id          = "read-existing"
 title       = "Read existing RPC methods for patterns"
@@ -61,8 +56,9 @@ description = """
 Add {{method_name}} to the server's method registry / router, following the
 same registration pattern used by existing methods.
 
-Verify the method is reachable — check that no namespace filter or
-allowlist would block it in the default configuration.
+The namespace is the prefix of {{method_name}} before the underscore
+(e.g. "eth" for "eth_getBalance"). Verify the server's namespace filter or
+allowlist includes this namespace in the default configuration.
 """
 needs       = ["implement-handler"]