Research doc: close open questions with decisions from review — hard
cutover on path_allowlist, drop glob (regex sufficient), stick with
Gateway API OR semantics for headers, case-insensitive method names.
PRD 0053: adopt Gateway API HTTPRoute match vocabulary (paths, methods,
headers) as the route schema replacement for path_allowlist. Add
MatchEntry / PathMatch / HeaderMatch types to EgressRoute design; cite
the route matching research doc; fold match restructure into chunk 1
alongside the dlp block.
Adds the product requirements document for replacing pipelock's DLP
capability with a per-route mitmproxy addon. Covers three implementation
chunks: token-pattern detection, known-secret detection, and naive prompt
injection scanning. References the research in PR #192 and issue #195.