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docs(memory): capitalize BDR-005 favicon strategy + LRN-002 PIL icon recipe

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- BDR-005: SVG primary + PIL-generated PNG/ICO fallback for favicon set;
  alternatives (rsvg-convert/inkscape, SVG-only, online generator) rejected
  with reasons; CV mirror deferred to user finalization.
- LRN-002: PIL supersample x8 + Lanczos downscale produces clean
  small-format icon antialiasing without rsvg-convert/inkscape/ImageMagick.
- journal: 2026-05-17 entry — extended-vitrine refactor (1369d27) +
  favicon set (ef31fb3); CV files left untouched (user WIP).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Bastien Chanot
2026-05-17 03:53:42 +02:00
co-authored by Claude Opus 4.7
parent ef31fb3059
commit 86d4c729ed
3 changed files with 32 additions and 0 deletions
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.claude/memory/learnings.md
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@@ -20,6 +20,7 @@ rules:
| ID | Date | Pattern | Applies to |
|----|------|---------|------------|
| LRN-001 | 2026-05-15 | certbot --nginx matches `server_name`, not filename | nginx + certbot on multi-site VPS |
| LRN-002 | 2026-05-17 | PIL supersample ×8 + Lanczos = clean icon antialiasing | Python stdlib icon generation |
---
@@ -29,3 +30,12 @@ rules:
- **Pattern**: `certbot install --cert-name X` (and `certbot --nginx -d X`) locates the target vhost by scanning every `server_name` directive in active nginx configs. The filename in `sites-available/` is irrelevant. A file named `X.conf` with `server_name Y;` inside will NOT be picked up for domain X.
- **Context**: `/etc/nginx/sites-available/bchanot.fr` existed and was symlinked into `sites-enabled/`, but its body still contained `server_name autreprojet.fr www.autreprojet.fr;` — a copy-paste leftover from a previous project. Certbot returned `Could not automatically find a matching server block for bchanot.fr`.
- **Future application**: Before running certbot on a multi-site VPS, `grep -n "server_name" /etc/nginx/sites-enabled/*` — confirm the target domain is actually declared inside, not just present in the filename. Same logic applies when troubleshooting "why is nginx serving the wrong site" — match by `server_name`, never by filename.
---
## LRN-002 — PIL supersample ×8 + Lanczos = clean small-format icon antialiasing
- **Date**: 2026-05-17
- **Pattern**: Render icon at 8× target size via `ImageDraw.rounded_rectangle` + `ellipse` on RGBA canvas, then `Image.resize((target, target), Image.LANCZOS)`. Output rivals `rsvg-convert` / `inkscape` for simple geometric shapes. Crisp at 16×16 favicon scale, no visible jaggies.
- **Context**: Generated `favicon-32.png`, `apple-touch-icon.png` (180×180), `favicon.ico` (multi-size 16/24/32/48) for `bchanot.fr` from scratch — no `rsvg-convert` / `inkscape` / `ImageMagick` on host. Single PIL script, ~20 lines.
- **Future application**: Any project needing a PNG/ICO icon set with a stdlib-only Python toolchain. Skip if shape is complex (text rendering, gradients, curves) — use `rsvg-convert` or commit a finalized PNG instead.