Bump 2.0.1: fixes, docs & API cleanup

Release bump to 2.0.1 with bug fixes, internal refactors, docs/examples updates, and tests.

Changes:
- Bumped package version to 2.0.1 and added changelog entry.
- Fix truncate behavior: do not append suffix when text already fits within max_len.
- Make starts_with_any / ends_with_any grapheme-aware (use public starts_with/ends_with).
- Correct center docs to indicate right-biased padding when uneven.
- Simplify find_emoji_index API (remove unused start parameter) and tighten its loop.
- Replace repeat_str implementation to a direct recursive loop to avoid intermediate list allocation.
- Update examples and docs to use the public `str` API (and `str/advanced` where applicable) and to reflect internal module path changes (src/str/internal/*).
- Update tokenizer docs to reference public `str.chars` / `str.chars_stdlib` and mark internal tokenizer module.
- Add regression tests for truncate noop, grapheme-aware starts/ends_with_any, and center right-bias.

Other: various documentation cleanups and example callsite adjustments to match the 2.0 public API.

Author: lupodevelop

CHANGELOG.md

@@ -2,6 +2,31 @@
 
 All notable changes to this project are documented in this file.
 
+## [2.0.1] - 2026-02-28
+
+### Fixed
+
+- **`truncate_with_flag`**: text that already fits within `max_len` was still being truncated when `text_len + suffix_len > max_len`. For example `truncate("Hello!", 8, "...")` returned `"Hello..."` instead of `"Hello!"`. The suffix is now only appended when the text is actually cut.
+- **`starts_with_any` / `ends_with_any`**: used the stdlib's byte-level `string.starts_with`/`string.ends_with` instead of the library's grapheme-aware versions, causing incorrect matches on strings with combining marks (e.g. `"e\u{0301}"` would wrongly match prefix `"e"`).
+- **`center` doc comment**: stated "left side receives more" but the implementation gives more padding to the right side. Comment corrected.
+
+### Changed
+
+- **`find_emoji_index`**: removed unused `start` parameter that was always passed as `0`, simplified the internal loop.
+- **`repeat_str`**: replaced `list.range` + `list.fold` with a direct recursive loop to avoid an intermediate list allocation.
+
+### Tests
+
+- Added regression tests for the `truncate` noop case, grapheme-aware `starts_with_any`/`ends_with_any`, and `center` right-bias.
+
+### Documentation
+
+- Updated examples and documentation to reflect the 2.0 public API and clean up outdated snippets.
+
+Contributed by: Daniele (`lupodevelop`)
+
+---
+
 ## [2.0.0] - 2026-01-24
 
 ### Major Release — Unified API