core/config: state the 0-based offsets of skill_read and fetch

src/plyngent/agent/directive_checkpoint.py

@@ -21,11 +21,13 @@ Tool playbook still applies (see system). Hard constraints:
 use `run_argv_batch` for ordered pipelines.
 - `edit_replace`: fix match / `max_replaces`; `edit_lineno` edits only lines read via \
 `read_file(with_lineno=true)`, and line numbers reset after any file write.
-- `read_file` results start with `L{begin}-{end}` (1-based lines; offset is 0-based).
+- `read_file` results start with `L{begin}-{end}` (1-based lines; offset is 0-based; \
+`skill_read` slices a skill file the same way).
 - `regex_files`: `pattern` is a Python `re` regex (not a glob, so `*.py` fails) and \
 `path` is a literal file/dir (no glob expansion).
 - Truncated results carry a `truncate_token=...`; continue with `get_truncated`.
-- Prefer `fetch` for HTTP(S); private/LAN hosts need human policy allow (not YOLO).
+- Prefer `fetch` for HTTP(S); `offset` (0-based) skips leading body characters; \
+private/LAN hosts need human policy allow (not YOLO).
 - PTY secrets only via `ask_into_pty`; denylists and confirms still apply.
 - `wait` pauses; pressing Enter disturbs early (optional reason).
 - Todo stack: open items mean unfinished work; the stack does not auto-clear — \

src/plyngent/config/models.py

@@ -52,7 +52,8 @@ raise `max_replaces` or narrow `old_string`.
 re-read with line numbers after any `edit_*` / `write_file` / copy/move/delete, \
 since line numbers go stale.
 - `read_file` results start with a 1-based line range `L{begin}-{end}` (`offset` \
-is 0-based); `with_lineno` shows per-line numbers instead.
+is 0-based); `with_lineno` shows per-line numbers instead. `skill_read` slices a \
+skill file the same way.
 - `regex_files` takes a Python `re` regex for `pattern`, not a filename glob \
 (`*.py` / `**/*.py` fail with `invalid regex`), and a literal file/dir `path` \
 (no glob expansion, so `src/**/*.py` fails with `path does not exist`); there is \
@@ -72,7 +73,8 @@ for ordered pipelines (`pipe_out` / `mix_stderr` as needed).
 - Prefer `vcs_*` for status/diff/log/branch when enough.
 
 ### Network
-- Prefer `fetch` (GET/POST/PUT/DELETE) for HTTP(S) docs/APIs over curl/wget via shell.
+- Prefer `fetch` (GET/POST/PUT/DELETE) for HTTP(S) docs/APIs over curl/wget via shell; \
+`offset` (0-based) skips leading body characters to page through a large body.
 - Set `user_agent` (or a User-Agent header) when the remote expects a specific client; \
 otherwise a small default is used. Never rely on shell to spoof identity.
 - Private/loopback/LAN hosts need an explicit human policy allow (not skipped by YOLO).